diff --git a/.eslintrc.js b/.eslintrc.js
index 56e3d0530..177496d3a 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -41,6 +41,11 @@ module.exports = {
       'node_modules',
       '\\.(css|scss|json)$',
     ],
+    'import/resolver': {
+      node: {
+        paths: ['app/javascript'],
+      },
+    },
   },
 
   rules: {
diff --git a/Gemfile.lock b/Gemfile.lock
index ce961afa8..76bcdeda5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -271,7 +271,7 @@ GEM
     httplog (1.2.0)
       rack (>= 1.0)
       rainbow (>= 2.0.0)
-    i18n (1.5.2)
+    i18n (1.5.3)
       concurrent-ruby (~> 1.0)
     i18n-tasks (0.9.28)
       activesupport (>= 4.0.2)
@@ -457,7 +457,7 @@ GEM
       nokogiri (>= 1.6)
     rails-html-sanitizer (1.0.4)
       loofah (~> 2.2, >= 2.2.2)
-    rails-i18n (5.1.2)
+    rails-i18n (5.1.3)
       i18n (>= 0.7, < 2)
       railties (>= 5.0, < 6)
     rails-settings-cached (0.6.6)
diff --git a/app/helpers/stream_entries_helper.rb b/app/helpers/stream_entries_helper.rb
index 792a91162..e2a303a77 100644
--- a/app/helpers/stream_entries_helper.rb
+++ b/app/helpers/stream_entries_helper.rb
@@ -176,7 +176,7 @@ module StreamEntriesHelper
     when 'public'
       fa_icon 'globe fw'
     when 'unlisted'
-      fa_icon 'unlock-alt fw'
+      fa_icon 'unlock fw'
     when 'private'
       fa_icon 'lock fw'
     when 'direct'
diff --git a/app/javascript/flavours/glitch/components/account.js b/app/javascript/flavours/glitch/components/account.js
index 072c601e0..4fcafc509 100644
--- a/app/javascript/flavours/glitch/components/account.js
+++ b/app/javascript/flavours/glitch/components/account.js
@@ -85,7 +85,7 @@ export default class Account extends ImmutablePureComponent {
       if (requested) {
         buttons = <IconButton disabled icon='hourglass' title={intl.formatMessage(messages.requested)} />;
       } else if (blocking) {
-        buttons = <IconButton active icon='unlock-alt' title={intl.formatMessage(messages.unblock, { name: account.get('username') })} onClick={this.handleBlock} />;
+        buttons = <IconButton active icon='unlock' title={intl.formatMessage(messages.unblock, { name: account.get('username') })} onClick={this.handleBlock} />;
       } else if (muting) {
         let hidingNotificationsButton;
         if (account.getIn(['relationship', 'muting_notifications'])) {
diff --git a/app/javascript/flavours/glitch/components/domain.js b/app/javascript/flavours/glitch/components/domain.js
index f657cb8d2..74174f83d 100644
--- a/app/javascript/flavours/glitch/components/domain.js
+++ b/app/javascript/flavours/glitch/components/domain.js
@@ -32,7 +32,7 @@ export default class Account extends ImmutablePureComponent {
           </span>
 
           <div className='domain__buttons'>
-            <IconButton active icon='unlock-alt' title={intl.formatMessage(messages.unblockDomain, { domain })} onClick={this.handleDomainUnblock} />
+            <IconButton active icon='unlock' title={intl.formatMessage(messages.unblockDomain, { domain })} onClick={this.handleDomainUnblock} />
           </div>
         </div>
       </div>
diff --git a/app/javascript/flavours/glitch/components/status_visibility_icon.js b/app/javascript/flavours/glitch/components/status_visibility_icon.js
index 017b69cbb..5e7b8ed00 100644
--- a/app/javascript/flavours/glitch/components/status_visibility_icon.js
+++ b/app/javascript/flavours/glitch/components/status_visibility_icon.js
@@ -25,7 +25,7 @@ export default class VisibilityIcon extends ImmutablePureComponent {
 
     const visibilityClass = {
       public: 'globe',
-      unlisted: 'unlock-alt',
+      unlisted: 'unlock',
       private: 'lock',
       direct: 'envelope',
     }[visibility];
diff --git a/app/javascript/flavours/glitch/features/account/components/header.js b/app/javascript/flavours/glitch/features/account/components/header.js
index dc5b1447b..96696c2a5 100644
--- a/app/javascript/flavours/glitch/features/account/components/header.js
+++ b/app/javascript/flavours/glitch/features/account/components/header.js
@@ -88,7 +88,7 @@ export default class Header extends ImmutablePureComponent {
       } else if (account.getIn(['relationship', 'blocking'])) {
         actionBtn = (
           <div className='account--action-button'>
-            <IconButton size={26} icon='unlock-alt' title={intl.formatMessage(messages.unblock, { name: account.get('username') })} onClick={this.props.onBlock} />
+            <IconButton size={26} icon='unlock' title={intl.formatMessage(messages.unblock, { name: account.get('username') })} onClick={this.props.onBlock} />
           </div>
         );
       }
diff --git a/app/javascript/flavours/glitch/features/composer/options/index.js b/app/javascript/flavours/glitch/features/composer/options/index.js
index 05cbe24c9..9fe3abc03 100644
--- a/app/javascript/flavours/glitch/features/composer/options/index.js
+++ b/app/javascript/flavours/glitch/features/composer/options/index.js
@@ -197,7 +197,7 @@ export default class ComposerOptions extends React.PureComponent {
         text: <FormattedMessage {...messages.public_short} />,
       },
       unlisted: {
-        icon: 'unlock-alt',
+        icon: 'unlock',
         meta: <FormattedMessage {...messages.unlisted_long} />,
         name: 'unlisted',
         text: <FormattedMessage {...messages.unlisted_short} />,
diff --git a/app/javascript/flavours/glitch/features/composer/publisher/index.js b/app/javascript/flavours/glitch/features/composer/publisher/index.js
index 5ded26f80..dc9c8f8eb 100644
--- a/app/javascript/flavours/glitch/features/composer/publisher/index.js
+++ b/app/javascript/flavours/glitch/features/composer/publisher/index.js
@@ -58,7 +58,7 @@ export default function ComposerPublisher ({
               <Icon
                 icon={{
                   public: 'globe',
-                  unlisted: 'unlock-alt',
+                  unlisted: 'unlock',
                   private: 'lock',
                   direct: 'envelope',
                 }[sideArm]}
@@ -82,7 +82,7 @@ export default function ComposerPublisher ({
                     direct: 'envelope',
                     private: 'lock',
                     public: 'globe',
-                    unlisted: 'unlock-alt',
+                    unlisted: 'unlock',
                   }[privacy]}
                 />
                 {' '}
diff --git a/app/javascript/flavours/glitch/styles/contrast/diff.scss b/app/javascript/flavours/glitch/styles/contrast/diff.scss
index eee9ecc3e..7d8993a50 100644
--- a/app/javascript/flavours/glitch/styles/contrast/diff.scss
+++ b/app/javascript/flavours/glitch/styles/contrast/diff.scss
@@ -12,3 +12,54 @@
     }
   }
 }
+
+.status__content a,
+.reply-indicator__content a {
+  color: lighten($ui-highlight-color, 12%);
+  text-decoration: underline;
+
+  &.mention {
+    text-decoration: none;
+  }
+
+  &.mention span {
+    text-decoration: underline;
+
+    &:hover,
+    &:focus,
+    &:active {
+      text-decoration: none;
+    }
+  }
+
+  &:hover,
+  &:focus,
+  &:active {
+    text-decoration: none;
+  }
+
+  &.status__content__spoiler-link {
+    color: $secondary-text-color;
+    text-decoration: none;
+  }
+}
+
+.status__content__read-more-button {
+  text-decoration: underline;
+
+  &:hover,
+  &:focus,
+  &:active {
+    text-decoration: none;
+  }
+}
+
+.getting-started__footer a {
+  text-decoration: underline;
+
+  &:hover,
+  &:focus,
+  &:active {
+    text-decoration: none;
+  }
+}
diff --git a/app/javascript/mastodon/components/account.js b/app/javascript/mastodon/components/account.js
index 206030c00..2705a6001 100644
--- a/app/javascript/mastodon/components/account.js
+++ b/app/javascript/mastodon/components/account.js
@@ -88,7 +88,7 @@ class Account extends ImmutablePureComponent {
       if (requested) {
         buttons = <IconButton disabled icon='hourglass' title={intl.formatMessage(messages.requested)} />;
       } else if (blocking) {
-        buttons = <IconButton active icon='unlock-alt' title={intl.formatMessage(messages.unblock, { name: account.get('username') })} onClick={this.handleBlock} />;
+        buttons = <IconButton active icon='unlock' title={intl.formatMessage(messages.unblock, { name: account.get('username') })} onClick={this.handleBlock} />;
       } else if (muting) {
         let hidingNotificationsButton;
         if (account.getIn(['relationship', 'muting_notifications'])) {
diff --git a/app/javascript/mastodon/components/attachment_list.js b/app/javascript/mastodon/components/attachment_list.js
index 8e5bb0e0b..5dfa1464c 100644
--- a/app/javascript/mastodon/components/attachment_list.js
+++ b/app/javascript/mastodon/components/attachment_list.js
@@ -2,6 +2,7 @@ import React from 'react';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import PropTypes from 'prop-types';
 import ImmutablePureComponent from 'react-immutable-pure-component';
+import Icon from 'mastodon/components/icon';
 
 const filename = url => url.split('/').pop().split('#')[0].split('?')[0];
 
@@ -24,7 +25,7 @@ export default class AttachmentList extends ImmutablePureComponent {
 
               return (
                 <li key={attachment.get('id')}>
-                  <a href={displayUrl} target='_blank' rel='noopener'><i className='fa fa-link' /> {filename(displayUrl)}</a>
+                  <a href={displayUrl} target='_blank' rel='noopener'><Icon id='link' /> {filename(displayUrl)}</a>
                 </li>
               );
             })}
@@ -36,7 +37,7 @@ export default class AttachmentList extends ImmutablePureComponent {
     return (
       <div className='attachment-list'>
         <div className='attachment-list__icon'>
-          <i className='fa fa-link' />
+          <Icon id='link' />
         </div>
 
         <ul className='attachment-list__list'>
diff --git a/app/javascript/mastodon/components/column_back_button.js b/app/javascript/mastodon/components/column_back_button.js
index 8a60c4192..f41045787 100644
--- a/app/javascript/mastodon/components/column_back_button.js
+++ b/app/javascript/mastodon/components/column_back_button.js
@@ -1,6 +1,7 @@
 import React from 'react';
 import { FormattedMessage } from 'react-intl';
 import PropTypes from 'prop-types';
+import Icon from 'mastodon/components/icon';
 
 export default class ColumnBackButton extends React.PureComponent {
 
@@ -19,7 +20,7 @@ export default class ColumnBackButton extends React.PureComponent {
   render () {
     return (
       <button onClick={this.handleClick} className='column-back-button'>
-        <i className='fa fa-fw fa-chevron-left column-back-button__icon' />
+        <Icon id='chevron-left' className='column-back-button__icon' fixedWidth />
         <FormattedMessage id='column_back_button.label' defaultMessage='Back' />
       </button>
     );
diff --git a/app/javascript/mastodon/components/column_back_button_slim.js b/app/javascript/mastodon/components/column_back_button_slim.js
index 964c100be..cc8bfb151 100644
--- a/app/javascript/mastodon/components/column_back_button_slim.js
+++ b/app/javascript/mastodon/components/column_back_button_slim.js
@@ -1,6 +1,7 @@
 import React from 'react';
 import { FormattedMessage } from 'react-intl';
 import ColumnBackButton from './column_back_button';
+import Icon from 'mastodon/components/icon';
 
 export default class ColumnBackButtonSlim extends ColumnBackButton {
 
@@ -8,7 +9,7 @@ export default class ColumnBackButtonSlim extends ColumnBackButton {
     return (
       <div className='column-back-button--slim'>
         <div role='button' tabIndex='0' onClick={this.handleClick} className='column-back-button column-back-button--slim-button'>
-          <i className='fa fa-fw fa-chevron-left column-back-button__icon' />
+          <Icon id='chevron-left' className='column-back-button__icon' fixedWidth />
           <FormattedMessage id='column_back_button.label' defaultMessage='Back' />
         </div>
       </div>
diff --git a/app/javascript/mastodon/components/column_header.js b/app/javascript/mastodon/components/column_header.js
index f68e4155e..f33c689e7 100644
--- a/app/javascript/mastodon/components/column_header.js
+++ b/app/javascript/mastodon/components/column_header.js
@@ -2,6 +2,7 @@ import React from 'react';
 import PropTypes from 'prop-types';
 import classNames from 'classnames';
 import { FormattedMessage, injectIntl, defineMessages } from 'react-intl';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   show: { id: 'column_header.show_settings', defaultMessage: 'Show settings' },
@@ -109,22 +110,22 @@ class ColumnHeader extends React.PureComponent {
     }
 
     if (multiColumn && pinned) {
-      pinButton = <button key='pin-button' className='text-btn column-header__setting-btn' onClick={this.handlePin}><i className='fa fa fa-times' /> <FormattedMessage id='column_header.unpin' defaultMessage='Unpin' /></button>;
+      pinButton = <button key='pin-button' className='text-btn column-header__setting-btn' onClick={this.handlePin}><Icon id='times' /> <FormattedMessage id='column_header.unpin' defaultMessage='Unpin' /></button>;
 
       moveButtons = (
         <div key='move-buttons' className='column-header__setting-arrows'>
-          <button title={formatMessage(messages.moveLeft)} aria-label={formatMessage(messages.moveLeft)} className='text-btn column-header__setting-btn' onClick={this.handleMoveLeft}><i className='fa fa-chevron-left' /></button>
-          <button title={formatMessage(messages.moveRight)} aria-label={formatMessage(messages.moveRight)} className='text-btn column-header__setting-btn' onClick={this.handleMoveRight}><i className='fa fa-chevron-right' /></button>
+          <button title={formatMessage(messages.moveLeft)} aria-label={formatMessage(messages.moveLeft)} className='text-btn column-header__setting-btn' onClick={this.handleMoveLeft}><Icon id='chevron-left' /></button>
+          <button title={formatMessage(messages.moveRight)} aria-label={formatMessage(messages.moveRight)} className='text-btn column-header__setting-btn' onClick={this.handleMoveRight}><Icon id='chevron-right' /></button>
         </div>
       );
     } else if (multiColumn) {
-      pinButton = <button key='pin-button' className='text-btn column-header__setting-btn' onClick={this.handlePin}><i className='fa fa fa-plus' /> <FormattedMessage id='column_header.pin' defaultMessage='Pin' /></button>;
+      pinButton = <button key='pin-button' className='text-btn column-header__setting-btn' onClick={this.handlePin}><Icon id='plus' /> <FormattedMessage id='column_header.pin' defaultMessage='Pin' /></button>;
     }
 
     if (!pinned && (multiColumn || showBackButton)) {
       backButton = (
         <button onClick={this.handleBackClick} className='column-header__back-button'>
-          <i className='fa fa-fw fa-chevron-left column-back-button__icon' />
+          <Icon id='chevron-left' className='column-back-button__icon' fixedWidth />
           <FormattedMessage id='column_back_button.label' defaultMessage='Back' />
         </button>
       );
@@ -140,7 +141,7 @@ class ColumnHeader extends React.PureComponent {
     }
 
     if (children || multiColumn) {
-      collapseButton = <button className={collapsibleButtonClassName} title={formatMessage(collapsed ? messages.show : messages.hide)} aria-label={formatMessage(collapsed ? messages.show : messages.hide)} aria-pressed={collapsed ? 'false' : 'true'} onClick={this.handleToggleClick}><i className='fa fa-sliders' /></button>;
+      collapseButton = <button className={collapsibleButtonClassName} title={formatMessage(collapsed ? messages.show : messages.hide)} aria-label={formatMessage(collapsed ? messages.show : messages.hide)} aria-pressed={collapsed ? 'false' : 'true'} onClick={this.handleToggleClick}><Icon id='sliders' /></button>;
     }
 
     const hasTitle = icon && title;
@@ -150,7 +151,7 @@ class ColumnHeader extends React.PureComponent {
         <h1 className={buttonClassName}>
           {hasTitle && (
             <button onClick={this.handleTitleClick}>
-              <i className={`fa fa-fw fa-${icon} column-header__icon`} />
+              <Icon id={icon} fixedWidth className='column-header__icon' />
               {title}
             </button>
           )}
diff --git a/app/javascript/mastodon/components/domain.js b/app/javascript/mastodon/components/domain.js
index 24f80e788..85729ca94 100644
--- a/app/javascript/mastodon/components/domain.js
+++ b/app/javascript/mastodon/components/domain.js
@@ -32,7 +32,7 @@ class Account extends ImmutablePureComponent {
           </span>
 
           <div className='domain__buttons'>
-            <IconButton active icon='unlock-alt' title={intl.formatMessage(messages.unblockDomain, { domain })} onClick={this.handleDomainUnblock} />
+            <IconButton active icon='unlock' title={intl.formatMessage(messages.unblockDomain, { domain })} onClick={this.handleDomainUnblock} />
           </div>
         </div>
       </div>
diff --git a/app/javascript/mastodon/components/icon.js b/app/javascript/mastodon/components/icon.js
new file mode 100644
index 000000000..d8a17722f
--- /dev/null
+++ b/app/javascript/mastodon/components/icon.js
@@ -0,0 +1,21 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import classNames from 'classnames';
+
+export default class Icon extends React.PureComponent {
+
+  static propTypes = {
+    id: PropTypes.string.isRequired,
+    className: PropTypes.string,
+    fixedWidth: PropTypes.bool,
+  };
+
+  render () {
+    const { id, className, fixedWidth, ...other } = this.props;
+
+    return (
+      <i role='img' className={classNames('fa', `fa-${id}`, className, { 'fa-fw': fixedWidth })} {...other} />
+    );
+  }
+
+}
diff --git a/app/javascript/mastodon/components/icon_button.js b/app/javascript/mastodon/components/icon_button.js
index b96e48fd0..fbb42f78f 100644
--- a/app/javascript/mastodon/components/icon_button.js
+++ b/app/javascript/mastodon/components/icon_button.js
@@ -3,6 +3,7 @@ import Motion from '../features/ui/util/optional_motion';
 import spring from 'react-motion/lib/spring';
 import PropTypes from 'prop-types';
 import classNames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 export default class IconButton extends React.PureComponent {
 
@@ -86,7 +87,7 @@ export default class IconButton extends React.PureComponent {
           style={style}
           tabIndex={tabIndex}
         >
-          <i className={`fa fa-fw fa-${icon}`} aria-hidden='true' />
+          <Icon id={icon} fixedWidth aria-hidden='true' />
         </button>
       );
     }
@@ -104,7 +105,7 @@ export default class IconButton extends React.PureComponent {
             style={style}
             tabIndex={tabIndex}
           >
-            <i style={{ transform: `rotate(${rotate}deg)` }} className={`fa fa-fw fa-${icon}`} aria-hidden='true' />
+            <Icon id={icon} style={{ transform: `rotate(${rotate}deg)` }} fixedWidth aria-hidden='true' />
           </button>
         )}
       </Motion>
diff --git a/app/javascript/mastodon/components/load_gap.js b/app/javascript/mastodon/components/load_gap.js
index ed4d445d0..a44d55d09 100644
--- a/app/javascript/mastodon/components/load_gap.js
+++ b/app/javascript/mastodon/components/load_gap.js
@@ -1,6 +1,7 @@
 import React from 'react';
 import PropTypes from 'prop-types';
 import { injectIntl, defineMessages } from 'react-intl';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   load_more: { id: 'status.load_more', defaultMessage: 'Load more' },
@@ -25,7 +26,7 @@ class LoadGap extends React.PureComponent {
 
     return (
       <button className='load-more load-gap' disabled={disabled} onClick={this.handleClick} aria-label={intl.formatMessage(messages.load_more)}>
-        <i className='fa fa-ellipsis-h' />
+        <Icon id='ellipsis-h' />
       </button>
     );
   }
diff --git a/app/javascript/mastodon/components/status.js b/app/javascript/mastodon/components/status.js
index 20d838500..2be6c4b36 100644
--- a/app/javascript/mastodon/components/status.js
+++ b/app/javascript/mastodon/components/status.js
@@ -15,6 +15,7 @@ import ImmutablePureComponent from 'react-immutable-pure-component';
 import { MediaGallery, Video } from '../features/ui/util/async-components';
 import { HotKeys } from 'react-hotkeys';
 import classNames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 // We use the component (and not the container) since we do not want
 // to use the progress bar to show download progress
@@ -204,7 +205,7 @@ class Status extends ImmutablePureComponent {
     if (featured) {
       prepend = (
         <div className='status__prepend'>
-          <div className='status__prepend-icon-wrapper'><i className='fa fa-fw fa-thumb-tack status__prepend-icon' /></div>
+          <div className='status__prepend-icon-wrapper'><Icon id='thumb-tack' className='status__prepend-icon' fixedWidth /></div>
           <FormattedMessage id='status.pinned' defaultMessage='Pinned toot' />
         </div>
       );
@@ -213,7 +214,7 @@ class Status extends ImmutablePureComponent {
 
       prepend = (
         <div className='status__prepend'>
-          <div className='status__prepend-icon-wrapper'><i className='fa fa-fw fa-retweet status__prepend-icon' /></div>
+          <div className='status__prepend-icon-wrapper'><Icon id='retweet' className='status__prepend-icon' fixedWidth /></div>
           <FormattedMessage id='status.reblogged_by' defaultMessage='{name} boosted' values={{ name: <a onClick={this.handleAccountClick} data-id={status.getIn(['account', 'id'])} href={status.getIn(['account', 'url'])} className='status__display-name muted'><bdi><strong dangerouslySetInnerHTML={display_name_html} /></bdi></a> }} />
         </div>
       );
diff --git a/app/javascript/mastodon/components/status_content.js b/app/javascript/mastodon/components/status_content.js
index 5e3365618..70713047d 100644
--- a/app/javascript/mastodon/components/status_content.js
+++ b/app/javascript/mastodon/components/status_content.js
@@ -5,6 +5,7 @@ import { isRtl } from '../rtl';
 import { FormattedMessage } from 'react-intl';
 import Permalink from './permalink';
 import classnames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 const MAX_HEIGHT = 642; // 20px * 32 (+ 2px padding at the top)
 
@@ -160,7 +161,7 @@ export default class StatusContent extends React.PureComponent {
 
     const readMoreButton = (
       <button className='status__content__read-more-button' onClick={this.props.onClick} key='read-more'>
-        <FormattedMessage id='status.read_more' defaultMessage='Read more' /><i className='fa fa-fw fa-angle-right' />
+        <FormattedMessage id='status.read_more' defaultMessage='Read more' /><Icon id='angle-right' fixedWidth />
       </button>
     );
 
diff --git a/app/javascript/mastodon/features/account/components/header.js b/app/javascript/mastodon/features/account/components/header.js
index 2ab25cde4..7fe6d6a4f 100644
--- a/app/javascript/mastodon/features/account/components/header.js
+++ b/app/javascript/mastodon/features/account/components/header.js
@@ -8,6 +8,7 @@ import spring from 'react-motion/lib/spring';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { autoPlayGif, me } from '../../../initial_state';
 import classNames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   unfollow: { id: 'account.unfollow', defaultMessage: 'Unfollow' },
@@ -132,7 +133,7 @@ class Header extends ImmutablePureComponent {
       } else if (account.getIn(['relationship', 'blocking'])) {
         actionBtn = (
           <div className='account--action-button'>
-            <IconButton size={26} icon='unlock-alt' title={intl.formatMessage(messages.unblock, { name: account.get('username') })} onClick={this.props.onBlock} />
+            <IconButton size={26} icon='unlock' title={intl.formatMessage(messages.unblock, { name: account.get('username') })} onClick={this.props.onBlock} />
           </div>
         );
       }
@@ -149,7 +150,7 @@ class Header extends ImmutablePureComponent {
     }
 
     if (account.get('locked')) {
-      lockedIcon = <i className='fa fa-lock' title={intl.formatMessage(messages.account_locked)} />;
+      lockedIcon = <Icon id='lock' title={intl.formatMessage(messages.account_locked)} />;
     }
 
     const content         = { __html: account.get('note_emojified') };
@@ -176,7 +177,7 @@ class Header extends ImmutablePureComponent {
                   <dt dangerouslySetInnerHTML={{ __html: pair.get('name_emojified') }} title={pair.get('name')} />
 
                   <dd className={pair.get('verified_at') && 'verified'} title={pair.get('value_plain')}>
-                    {pair.get('verified_at') && <span title={intl.formatMessage(messages.linkVerifiedOn, { date: intl.formatDate(pair.get('verified_at'), dateFormatOptions) })}><i className='fa fa-check verified__mark' /></span>} <span dangerouslySetInnerHTML={{ __html: pair.get('value_emojified') }} />
+                    {pair.get('verified_at') && <span title={intl.formatMessage(messages.linkVerifiedOn, { date: intl.formatDate(pair.get('verified_at'), dateFormatOptions) })}><Icon id='check' className='verified__mark' /></span>} <span dangerouslySetInnerHTML={{ __html: pair.get('value_emojified') }} />
                   </dd>
                 </dl>
               ))}
diff --git a/app/javascript/mastodon/features/account_gallery/components/media_item.js b/app/javascript/mastodon/features/account_gallery/components/media_item.js
index 7c330c430..80ac9d9ec 100644
--- a/app/javascript/mastodon/features/account_gallery/components/media_item.js
+++ b/app/javascript/mastodon/features/account_gallery/components/media_item.js
@@ -3,6 +3,7 @@ import ImmutablePropTypes from 'react-immutable-proptypes';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import Permalink from '../../../components/permalink';
 import { displayMedia } from '../../../initial_state';
+import Icon from 'mastodon/components/icon';
 
 export default class MediaItem extends ImmutablePureComponent {
 
@@ -45,7 +46,7 @@ export default class MediaItem extends ImmutablePureComponent {
     } else {
       icon = (
         <span className='account-gallery__item__icons'>
-          <i className='fa fa-eye-slash' />
+          <Icon id='eye-slash' />
         </span>
       );
     }
diff --git a/app/javascript/mastodon/features/account_timeline/components/moved_note.js b/app/javascript/mastodon/features/account_timeline/components/moved_note.js
index 280389bba..3e090bb5f 100644
--- a/app/javascript/mastodon/features/account_timeline/components/moved_note.js
+++ b/app/javascript/mastodon/features/account_timeline/components/moved_note.js
@@ -5,6 +5,7 @@ import { FormattedMessage } from 'react-intl';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import AvatarOverlay from '../../../components/avatar_overlay';
 import DisplayName from '../../../components/display_name';
+import Icon from 'mastodon/components/icon';
 
 export default class MovedNote extends ImmutablePureComponent {
 
@@ -33,7 +34,7 @@ export default class MovedNote extends ImmutablePureComponent {
     return (
       <div className='account__moved-note'>
         <div className='account__moved-note__message'>
-          <div className='account__moved-note__icon-wrapper'><i className='fa fa-fw fa-suitcase account__moved-note__icon' /></div>
+          <div className='account__moved-note__icon-wrapper'><Icon id='suitcase' className='account__moved-note__icon' fixedWidth /></div>
           <FormattedMessage id='account.moved_to' defaultMessage='{name} has moved to:' values={{ name: <bdi><strong dangerouslySetInnerHTML={displayNameHtml} /></bdi> }} />
         </div>
 
diff --git a/app/javascript/mastodon/features/compose/components/compose_form.js b/app/javascript/mastodon/features/compose/components/compose_form.js
index d6add9b0d..07faa4132 100644
--- a/app/javascript/mastodon/features/compose/components/compose_form.js
+++ b/app/javascript/mastodon/features/compose/components/compose_form.js
@@ -17,6 +17,7 @@ import { isMobile } from '../../../is_mobile';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { length } from 'stringz';
 import { countableText } from '../util/counter';
+import Icon from 'mastodon/components/icon';
 import { maxChars } from '../../../initial_state';
 
 const allowedAroundShortCode = '><\u0085\u0020\u00a0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000\u2028\u2029\u0009\u000a\u000b\u000c\u000d';
@@ -166,7 +167,7 @@ class ComposeForm extends ImmutablePureComponent {
     let publishText = '';
 
     if (this.props.privacy === 'private' || this.props.privacy === 'direct') {
-      publishText = <span className='compose-form__publish-private'><i className='fa fa-lock' /> {intl.formatMessage(messages.publish)}</span>;
+      publishText = <span className='compose-form__publish-private'><Icon id='lock' /> {intl.formatMessage(messages.publish)}</span>;
     } else {
       publishText = this.props.privacy !== 'unlisted' ? intl.formatMessage(messages.publishLoud, { publish: intl.formatMessage(messages.publish) }) : intl.formatMessage(messages.publish);
     }
diff --git a/app/javascript/mastodon/features/compose/components/privacy_dropdown.js b/app/javascript/mastodon/features/compose/components/privacy_dropdown.js
index 5698765d9..3288f81f8 100644
--- a/app/javascript/mastodon/features/compose/components/privacy_dropdown.js
+++ b/app/javascript/mastodon/features/compose/components/privacy_dropdown.js
@@ -7,6 +7,7 @@ import Motion from '../../ui/util/optional_motion';
 import spring from 'react-motion/lib/spring';
 import detectPassiveEvents from 'detect-passive-events';
 import classNames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   public_short: { id: 'privacy.public.short', defaultMessage: 'Public' },
@@ -132,7 +133,7 @@ class PrivacyDropdownMenu extends React.PureComponent {
             {items.map(item => (
               <div role='option' tabIndex='0' key={item.value} data-index={item.value} onKeyDown={this.handleKeyDown} onClick={this.handleClick} className={classNames('privacy-dropdown__option', { active: item.value === value })} aria-selected={item.value === value} ref={item.value === value ? this.setFocusRef : null}>
                 <div className='privacy-dropdown__option__icon'>
-                  <i className={`fa fa-fw fa-${item.icon}`} />
+                  <Icon id={item.icon} fixedWidth />
                 </div>
 
                 <div className='privacy-dropdown__option__content'>
@@ -214,7 +215,7 @@ class PrivacyDropdown extends React.PureComponent {
 
     this.options = [
       { icon: 'globe', value: 'public', text: formatMessage(messages.public_short), meta: formatMessage(messages.public_long) },
-      { icon: 'unlock-alt', value: 'unlisted', text: formatMessage(messages.unlisted_short), meta: formatMessage(messages.unlisted_long) },
+      { icon: 'unlock', value: 'unlisted', text: formatMessage(messages.unlisted_short), meta: formatMessage(messages.unlisted_long) },
       { icon: 'lock', value: 'private', text: formatMessage(messages.private_short), meta: formatMessage(messages.private_long) },
       { icon: 'envelope', value: 'direct', text: formatMessage(messages.direct_short), meta: formatMessage(messages.direct_long) },
     ];
diff --git a/app/javascript/mastodon/features/compose/components/search.js b/app/javascript/mastodon/features/compose/components/search.js
index d203d8780..1ab197ac5 100644
--- a/app/javascript/mastodon/features/compose/components/search.js
+++ b/app/javascript/mastodon/features/compose/components/search.js
@@ -5,6 +5,7 @@ import Overlay from 'react-overlays/lib/Overlay';
 import Motion from '../../ui/util/optional_motion';
 import spring from 'react-motion/lib/spring';
 import { searchEnabled } from '../../../initial_state';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   placeholder: { id: 'search.placeholder', defaultMessage: 'Search' },
@@ -116,8 +117,8 @@ class Search extends React.PureComponent {
         </label>
 
         <div role='button' tabIndex='0' className='search__icon' onClick={this.handleClear}>
-          <i className={`fa fa-search ${hasValue ? '' : 'active'}`} />
-          <i aria-label={intl.formatMessage(messages.placeholder)} className={`fa fa-times-circle ${hasValue ? 'active' : ''}`} />
+          <Icon id='search' className={hasValue ? '' : 'active'} />
+          <Icon id='times-circle' className={hasValue ? 'active' : ''} aria-label={intl.formatMessage(messages.placeholder)} />
         </div>
 
         <Overlay show={expanded && !hasValue} placement='bottom' target={this}>
diff --git a/app/javascript/mastodon/features/compose/components/search_results.js b/app/javascript/mastodon/features/compose/components/search_results.js
index f0ddf6d71..e0966f52c 100644
--- a/app/javascript/mastodon/features/compose/components/search_results.js
+++ b/app/javascript/mastodon/features/compose/components/search_results.js
@@ -6,6 +6,7 @@ import AccountContainer from '../../../containers/account_container';
 import StatusContainer from '../../../containers/status_container';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import Hashtag from '../../../components/hashtag';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   dismissSuggestion: { id: 'suggestions.dismiss', defaultMessage: 'Dismiss suggestion' },
@@ -34,7 +35,7 @@ class SearchResults extends ImmutablePureComponent {
         <div className='search-results'>
           <div className='trends'>
             <div className='trends__header'>
-              <i className='fa fa-user-plus fa-fw' />
+              <Icon id='user-plus' fixedWidth />
               <FormattedMessage id='suggestions.header' defaultMessage='You might be interested in…' />
             </div>
 
@@ -59,7 +60,7 @@ class SearchResults extends ImmutablePureComponent {
       count   += results.get('accounts').size;
       accounts = (
         <div className='search-results__section'>
-          <h5><i className='fa fa-fw fa-users' /><FormattedMessage id='search_results.accounts' defaultMessage='People' /></h5>
+          <h5><Icon id='users' fixedWidth /><FormattedMessage id='search_results.accounts' defaultMessage='People' /></h5>
 
           {results.get('accounts').map(accountId => <AccountContainer key={accountId} id={accountId} />)}
         </div>
@@ -70,7 +71,7 @@ class SearchResults extends ImmutablePureComponent {
       count   += results.get('statuses').size;
       statuses = (
         <div className='search-results__section'>
-          <h5><i className='fa fa-fw fa-quote-right' /><FormattedMessage id='search_results.statuses' defaultMessage='Toots' /></h5>
+          <h5><Icon id='quote-right' fixedWidth /><FormattedMessage id='search_results.statuses' defaultMessage='Toots' /></h5>
 
           {results.get('statuses').map(statusId => <StatusContainer key={statusId} id={statusId} />)}
         </div>
@@ -81,7 +82,7 @@ class SearchResults extends ImmutablePureComponent {
       count += results.get('hashtags').size;
       hashtags = (
         <div className='search-results__section'>
-          <h5><i className='fa fa-fw fa-hashtag' /><FormattedMessage id='search_results.hashtags' defaultMessage='Hashtags' /></h5>
+          <h5><Icon id='hashtag' fixedWidth /><FormattedMessage id='search_results.hashtags' defaultMessage='Hashtags' /></h5>
 
           {results.get('hashtags').map(hashtag => <Hashtag key={hashtag.get('name')} hashtag={hashtag} />)}
         </div>
@@ -91,7 +92,7 @@ class SearchResults extends ImmutablePureComponent {
     return (
       <div className='search-results'>
         <div className='search-results__header'>
-          <i className='fa fa-search fa-fw' />
+          <Icon id='search' fixedWidth />
           <FormattedMessage id='search_results.total' defaultMessage='{count, number} {count, plural, one {result} other {results}}' values={{ count }} />
         </div>
 
diff --git a/app/javascript/mastodon/features/compose/components/upload.js b/app/javascript/mastodon/features/compose/components/upload.js
index a1e99dcbb..038d7ee28 100644
--- a/app/javascript/mastodon/features/compose/components/upload.js
+++ b/app/javascript/mastodon/features/compose/components/upload.js
@@ -6,6 +6,7 @@ import spring from 'react-motion/lib/spring';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import classNames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   description: { id: 'upload_form.description', defaultMessage: 'Describe for the visually impaired' },
@@ -99,8 +100,8 @@ class Upload extends ImmutablePureComponent {
           {({ scale }) => (
             <div className='compose-form__upload-thumbnail' style={{ transform: `scale(${scale})`, backgroundImage: `url(${media.get('preview_url')})`, backgroundPosition: `${x}% ${y}%` }}>
               <div className={classNames('compose-form__upload__actions', { active })}>
-                <button className='icon-button' onClick={this.handleUndoClick}><i className='fa fa-times' /> <FormattedMessage id='upload_form.undo' defaultMessage='Delete' /></button>
-                {media.get('type') === 'image' && <button className='icon-button' onClick={this.handleFocalPointClick}><i className='fa fa-crosshairs' /> <FormattedMessage id='upload_form.focus' defaultMessage='Crop' /></button>}
+                <button className='icon-button' onClick={this.handleUndoClick}><Icon id='times' /> <FormattedMessage id='upload_form.undo' defaultMessage='Delete' /></button>
+                {media.get('type') === 'image' && <button className='icon-button' onClick={this.handleFocalPointClick}><Icon id='crosshairs' /> <FormattedMessage id='upload_form.focus' defaultMessage='Crop' /></button>}
               </div>
 
               <div className={classNames('compose-form__upload-description', { active })}>
diff --git a/app/javascript/mastodon/features/compose/components/upload_progress.js b/app/javascript/mastodon/features/compose/components/upload_progress.js
index d5e6f19cd..cbe58f573 100644
--- a/app/javascript/mastodon/features/compose/components/upload_progress.js
+++ b/app/javascript/mastodon/features/compose/components/upload_progress.js
@@ -3,6 +3,7 @@ import PropTypes from 'prop-types';
 import Motion from '../../ui/util/optional_motion';
 import spring from 'react-motion/lib/spring';
 import { FormattedMessage } from 'react-intl';
+import Icon from 'mastodon/components/icon';
 
 export default class UploadProgress extends React.PureComponent {
 
@@ -21,7 +22,7 @@ export default class UploadProgress extends React.PureComponent {
     return (
       <div className='upload-progress'>
         <div className='upload-progress__icon'>
-          <i className='fa fa-upload' />
+          <Icon id='upload' />
         </div>
 
         <div className='upload-progress__message'>
diff --git a/app/javascript/mastodon/features/compose/index.js b/app/javascript/mastodon/features/compose/index.js
index d76cd76e6..fff329106 100644
--- a/app/javascript/mastodon/features/compose/index.js
+++ b/app/javascript/mastodon/features/compose/index.js
@@ -14,6 +14,7 @@ import SearchResultsContainer from './containers/search_results_container';
 import { changeComposing } from '../../actions/compose';
 import elephantUIPlane from '../../../images/elephant_ui_plane.svg';
 import { mascot } from '../../initial_state';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   start: { id: 'getting_started.heading', defaultMessage: 'Getting started' },
@@ -77,21 +78,21 @@ class Compose extends React.PureComponent {
       const { columns } = this.props;
       header = (
         <nav className='drawer__header'>
-          <Link to='/getting-started' className='drawer__tab' title={intl.formatMessage(messages.start)} aria-label={intl.formatMessage(messages.start)}><i role='img' className='fa fa-fw fa-bars' /></Link>
+          <Link to='/getting-started' className='drawer__tab' title={intl.formatMessage(messages.start)} aria-label={intl.formatMessage(messages.start)}><Icon id='bars' fixedWidth /></Link>
           {!columns.some(column => column.get('id') === 'HOME') && (
-            <Link to='/timelines/home' className='drawer__tab' title={intl.formatMessage(messages.home_timeline)} aria-label={intl.formatMessage(messages.home_timeline)}><i role='img' className='fa fa-fw fa-home' /></Link>
+            <Link to='/timelines/home' className='drawer__tab' title={intl.formatMessage(messages.home_timeline)} aria-label={intl.formatMessage(messages.home_timeline)}><Icon id='home' fixedWidth /></Link>
           )}
           {!columns.some(column => column.get('id') === 'NOTIFICATIONS') && (
-            <Link to='/notifications' className='drawer__tab' title={intl.formatMessage(messages.notifications)} aria-label={intl.formatMessage(messages.notifications)}><i role='img' className='fa fa-fw fa-bell' /></Link>
+            <Link to='/notifications' className='drawer__tab' title={intl.formatMessage(messages.notifications)} aria-label={intl.formatMessage(messages.notifications)}><Icon id='bell' fixedWidth /></Link>
           )}
           {!columns.some(column => column.get('id') === 'COMMUNITY') && (
-            <Link to='/timelines/public/local' className='drawer__tab' title={intl.formatMessage(messages.community)} aria-label={intl.formatMessage(messages.community)}><i role='img' className='fa fa-fw fa-users' /></Link>
+            <Link to='/timelines/public/local' className='drawer__tab' title={intl.formatMessage(messages.community)} aria-label={intl.formatMessage(messages.community)}><Icon id='users' fixedWidth /></Link>
           )}
           {!columns.some(column => column.get('id') === 'PUBLIC') && (
-            <Link to='/timelines/public' className='drawer__tab' title={intl.formatMessage(messages.public)} aria-label={intl.formatMessage(messages.public)}><i role='img' className='fa fa-fw fa-globe' /></Link>
+            <Link to='/timelines/public' className='drawer__tab' title={intl.formatMessage(messages.public)} aria-label={intl.formatMessage(messages.public)}><Icon id='globe' fixedWidth /></Link>
           )}
-          <a href='/settings/preferences' className='drawer__tab' title={intl.formatMessage(messages.preferences)} aria-label={intl.formatMessage(messages.preferences)}><i role='img' className='fa fa-fw fa-cog' /></a>
-          <a href='/auth/sign_out' className='drawer__tab' data-method='delete' title={intl.formatMessage(messages.logout)} aria-label={intl.formatMessage(messages.logout)}><i role='img' className='fa fa-fw fa-sign-out' /></a>
+          <a href='/settings/preferences' className='drawer__tab' title={intl.formatMessage(messages.preferences)} aria-label={intl.formatMessage(messages.preferences)}><Icon id='cog' fixedWidth /></a>
+          <a href='/auth/sign_out' className='drawer__tab' data-method='delete' title={intl.formatMessage(messages.logout)} aria-label={intl.formatMessage(messages.logout)}><Icon id='sign-out' fixedWidth /></a>
         </nav>
       );
     }
diff --git a/app/javascript/mastodon/features/getting_started/index.js b/app/javascript/mastodon/features/getting_started/index.js
index 709a3aa96..e277a73c7 100644
--- a/app/javascript/mastodon/features/getting_started/index.js
+++ b/app/javascript/mastodon/features/getting_started/index.js
@@ -12,6 +12,7 @@ import { fetchFollowRequests } from '../../actions/accounts';
 import { List as ImmutableList } from 'immutable';
 import { Link } from 'react-router-dom';
 import NavigationBar from '../compose/components/navigation_bar';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   home_timeline: { id: 'tabs_bar.home', defaultMessage: 'Home' },
@@ -140,7 +141,7 @@ class GettingStarted extends ImmutablePureComponent {
         {multiColumn && <div className='column-header__wrapper'>
           <h1 className='column-header'>
             <button>
-              <i className='fa fa-bars fa-fw column-header__icon' />
+              <Icon id='bars' className='column-header__icon' fixedWidth />
               <FormattedMessage id='getting_started.heading' defaultMessage='Getting started' />
             </button>
           </h1>
diff --git a/app/javascript/mastodon/features/list_adder/components/list.js b/app/javascript/mastodon/features/list_adder/components/list.js
index cb8eb7d7a..60c8958a7 100644
--- a/app/javascript/mastodon/features/list_adder/components/list.js
+++ b/app/javascript/mastodon/features/list_adder/components/list.js
@@ -6,6 +6,7 @@ import ImmutablePropTypes from 'react-immutable-proptypes';
 import IconButton from '../../../components/icon_button';
 import { defineMessages, injectIntl } from 'react-intl';
 import { removeFromListAdder, addToListAdder } from '../../../actions/lists';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   remove: { id: 'lists.account.remove', defaultMessage: 'Remove from list' },
@@ -53,7 +54,7 @@ class List extends ImmutablePureComponent {
       <div className='list'>
         <div className='list__wrapper'>
           <div className='list__display-name'>
-            <i className='fa fa-fw fa-list-ul column-link__icon' />
+            <Icon id='list-ul' className='column-link__icon' fixedWidth />
             {list.get('title')}
           </div>
 
diff --git a/app/javascript/mastodon/features/list_editor/components/search.js b/app/javascript/mastodon/features/list_editor/components/search.js
index f7617fe58..e3f069bb8 100644
--- a/app/javascript/mastodon/features/list_editor/components/search.js
+++ b/app/javascript/mastodon/features/list_editor/components/search.js
@@ -4,6 +4,7 @@ import { connect } from 'react-redux';
 import { defineMessages, injectIntl } from 'react-intl';
 import { fetchListSuggestions, clearListSuggestions, changeListSuggestions } from '../../../actions/lists';
 import classNames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   search: { id: 'lists.search', defaultMessage: 'Search among people you follow' },
@@ -65,8 +66,8 @@ class Search extends React.PureComponent {
         </label>
 
         <div role='button' tabIndex='0' className='search__icon' onClick={this.handleClear}>
-          <i className={classNames('fa fa-search', { active: !hasValue })} />
-          <i aria-label={intl.formatMessage(messages.search)} className={classNames('fa fa-times-circle', { active: hasValue })} />
+          <Icon id='search' className={classNames({ active: !hasValue })} />
+          <Icon id='times-circle' aria-label={intl.formatMessage(messages.search)} className={classNames({ active: hasValue })} />
         </div>
       </div>
     );
diff --git a/app/javascript/mastodon/features/list_timeline/index.js b/app/javascript/mastodon/features/list_timeline/index.js
index 5b047ace4..b6722e91a 100644
--- a/app/javascript/mastodon/features/list_timeline/index.js
+++ b/app/javascript/mastodon/features/list_timeline/index.js
@@ -14,6 +14,7 @@ import { fetchList, deleteList } from '../../actions/lists';
 import { openModal } from '../../actions/modal';
 import MissingIndicator from '../../components/missing_indicator';
 import LoadingIndicator from '../../components/loading_indicator';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   deleteMessage: { id: 'confirmations.delete_list.message', defaultMessage: 'Are you sure you want to permanently delete this list?' },
@@ -150,11 +151,11 @@ class ListTimeline extends React.PureComponent {
         >
           <div className='column-header__links'>
             <button className='text-btn column-header__setting-btn' tabIndex='0' onClick={this.handleEditClick}>
-              <i className='fa fa-pencil' /> <FormattedMessage id='lists.edit' defaultMessage='Edit list' />
+              <Icon id='pencil' /> <FormattedMessage id='lists.edit' defaultMessage='Edit list' />
             </button>
 
             <button className='text-btn column-header__setting-btn' tabIndex='0' onClick={this.handleDeleteClick}>
-              <i className='fa fa-trash' /> <FormattedMessage id='lists.delete' defaultMessage='Delete list' />
+              <Icon id='trash' /> <FormattedMessage id='lists.delete' defaultMessage='Delete list' />
             </button>
           </div>
 
diff --git a/app/javascript/mastodon/features/notifications/components/clear_column_button.js b/app/javascript/mastodon/features/notifications/components/clear_column_button.js
index e0bf4c82d..b82fd092f 100644
--- a/app/javascript/mastodon/features/notifications/components/clear_column_button.js
+++ b/app/javascript/mastodon/features/notifications/components/clear_column_button.js
@@ -1,6 +1,7 @@
 import React from 'react';
 import PropTypes from 'prop-types';
 import { FormattedMessage } from 'react-intl';
+import Icon from 'mastodon/components/icon';
 
 export default class ClearColumnButton extends React.PureComponent {
 
@@ -10,7 +11,7 @@ export default class ClearColumnButton extends React.PureComponent {
 
   render () {
     return (
-      <button className='text-btn column-header__setting-btn' tabIndex='0' onClick={this.props.onClick}><i className='fa fa-eraser' /> <FormattedMessage id='notifications.clear' defaultMessage='Clear notifications' /></button>
+      <button className='text-btn column-header__setting-btn' tabIndex='0' onClick={this.props.onClick}><Icon id='eraser' /> <FormattedMessage id='notifications.clear' defaultMessage='Clear notifications' /></button>
     );
   }
 
diff --git a/app/javascript/mastodon/features/notifications/components/filter_bar.js b/app/javascript/mastodon/features/notifications/components/filter_bar.js
index f95a2c9de..6ae8b7491 100644
--- a/app/javascript/mastodon/features/notifications/components/filter_bar.js
+++ b/app/javascript/mastodon/features/notifications/components/filter_bar.js
@@ -1,6 +1,7 @@
 import React from 'react';
 import PropTypes from 'prop-types';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
+import Icon from 'mastodon/components/icon';
 
 const tooltips = defineMessages({
   mentions: { id: 'notifications.filter.mentions', defaultMessage: 'Mentions' },
@@ -62,28 +63,28 @@ class FilterBar extends React.PureComponent {
           onClick={this.onClick('mention')}
           title={intl.formatMessage(tooltips.mentions)}
         >
-          <i className='fa fa-fw fa-at' />
+          <Icon id='at' fixedWidth />
         </button>
         <button
           className={selectedFilter === 'favourite' ? 'active' : ''}
           onClick={this.onClick('favourite')}
           title={intl.formatMessage(tooltips.favourites)}
         >
-          <i className='fa fa-fw fa-star' />
+          <Icon id='star' fixedWidth />
         </button>
         <button
           className={selectedFilter === 'reblog' ? 'active' : ''}
           onClick={this.onClick('reblog')}
           title={intl.formatMessage(tooltips.boosts)}
         >
-          <i className='fa fa-fw fa-retweet' />
+          <Icon id='retweet' fixedWidth />
         </button>
         <button
           className={selectedFilter === 'follow' ? 'active' : ''}
           onClick={this.onClick('follow')}
           title={intl.formatMessage(tooltips.follows)}
         >
-          <i className='fa fa-fw fa-user-plus' />
+          <Icon id='user-plus' fixedWidth />
         </button>
       </div>
     );
diff --git a/app/javascript/mastodon/features/notifications/components/notification.js b/app/javascript/mastodon/features/notifications/components/notification.js
index 97efff69c..0bd8d47c3 100644
--- a/app/javascript/mastodon/features/notifications/components/notification.js
+++ b/app/javascript/mastodon/features/notifications/components/notification.js
@@ -7,6 +7,7 @@ import { injectIntl, FormattedMessage } from 'react-intl';
 import Permalink from '../../../components/permalink';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { HotKeys } from 'react-hotkeys';
+import Icon from 'mastodon/components/icon';
 
 const notificationForScreenReader = (intl, message, timestamp) => {
   const output = [message];
@@ -105,7 +106,7 @@ class Notification extends ImmutablePureComponent {
         <div className='notification notification-follow focusable' tabIndex='0' aria-label={notificationForScreenReader(intl, intl.formatMessage({ id: 'notification.follow', defaultMessage: '{name} followed you' }, { name: account.get('acct') }), notification.get('created_at'))}>
           <div className='notification__message'>
             <div className='notification__favourite-icon-wrapper'>
-              <i className='fa fa-fw fa-user-plus' />
+              <Icon id='user-plus' fixedWidth />
             </div>
 
             <span title={notification.get('created_at')}>
@@ -140,7 +141,7 @@ class Notification extends ImmutablePureComponent {
         <div className='notification notification-favourite focusable' tabIndex='0' aria-label={notificationForScreenReader(intl, intl.formatMessage({ id: 'notification.favourite', defaultMessage: '{name} favourited your status' }, { name: notification.getIn(['account', 'acct']) }), notification.get('created_at'))}>
           <div className='notification__message'>
             <div className='notification__favourite-icon-wrapper'>
-              <i className='fa fa-fw fa-star star-icon' />
+              <Icon id='star' className='star-icon' fixedWidth />
             </div>
 
             <span title={notification.get('created_at')}>
@@ -162,7 +163,7 @@ class Notification extends ImmutablePureComponent {
         <div className='notification notification-reblog focusable' tabIndex='0' aria-label={notificationForScreenReader(intl, intl.formatMessage({ id: 'notification.reblog', defaultMessage: '{name} boosted your status' }, { name: notification.getIn(['account', 'acct']) }), notification.get('created_at'))}>
           <div className='notification__message'>
             <div className='notification__favourite-icon-wrapper'>
-              <i className='fa fa-fw fa-retweet' />
+              <Icon id='retweet' fixedWidth />
             </div>
 
             <span title={notification.get('created_at')}>
diff --git a/app/javascript/mastodon/features/status/components/card.js b/app/javascript/mastodon/features/status/components/card.js
index 8491299ef..8237de84d 100644
--- a/app/javascript/mastodon/features/status/components/card.js
+++ b/app/javascript/mastodon/features/status/components/card.js
@@ -4,6 +4,7 @@ import Immutable from 'immutable';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import punycode from 'punycode';
 import classnames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 const IDNA_PREFIX = 'xn--';
 
@@ -175,8 +176,8 @@ export default class Card extends React.PureComponent {
 
             <div className='status-card__actions'>
               <div>
-                <button onClick={this.handleEmbedClick}><i className={`fa fa-${iconVariant}`} /></button>
-                {horizontal && <a href={card.get('url')} target='_blank' rel='noopener'><i className='fa fa-external-link' /></a>}
+                <button onClick={this.handleEmbedClick}><Icon id={iconVariant} /></button>
+                {horizontal && <a href={card.get('url')} target='_blank' rel='noopener'><Icon id='external-link' /></a>}
               </div>
             </div>
           </div>
@@ -198,7 +199,7 @@ export default class Card extends React.PureComponent {
     } else {
       embed = (
         <div className='status-card__image'>
-          <i className='fa fa-file-text' />
+          <Icon id='file-text' />
         </div>
       );
     }
diff --git a/app/javascript/mastodon/features/status/components/detailed_status.js b/app/javascript/mastodon/features/status/components/detailed_status.js
index 0630387d2..734353c9b 100644
--- a/app/javascript/mastodon/features/status/components/detailed_status.js
+++ b/app/javascript/mastodon/features/status/components/detailed_status.js
@@ -13,6 +13,7 @@ import ImmutablePureComponent from 'react-immutable-pure-component';
 import Video from '../../video';
 import scheduleIdleTask from '../../ui/util/schedule_idle_task';
 import classNames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 export default class DetailedStatus extends ImmutablePureComponent {
 
@@ -148,11 +149,11 @@ export default class DetailedStatus extends ImmutablePureComponent {
     }
 
     if (status.get('visibility') === 'private') {
-      reblogLink = <i className={`fa fa-${reblogIcon}`} />;
+      reblogLink = <Icon id={reblogIcon} />;
     } else if (this.context.router) {
       reblogLink = (
         <Link to={`/statuses/${status.get('id')}/reblogs`} className='detailed-status__link'>
-          <i className={`fa fa-${reblogIcon}`} />
+          <Icon id={reblogIcon} />
           <span className='detailed-status__reblogs'>
             <FormattedNumber value={status.get('reblogs_count')} />
           </span>
@@ -161,7 +162,7 @@ export default class DetailedStatus extends ImmutablePureComponent {
     } else {
       reblogLink = (
         <a href={`/interact/${status.get('id')}?type=reblog`} className='detailed-status__link' onClick={this.handleModalLink}>
-          <i className={`fa fa-${reblogIcon}`} />
+          <Icon id={reblogIcon} />
           <span className='detailed-status__reblogs'>
             <FormattedNumber value={status.get('reblogs_count')} />
           </span>
@@ -172,7 +173,7 @@ export default class DetailedStatus extends ImmutablePureComponent {
     if (this.context.router) {
       favouriteLink = (
         <Link to={`/statuses/${status.get('id')}/favourites`} className='detailed-status__link'>
-          <i className='fa fa-star' />
+          <Icon id='star' />
           <span className='detailed-status__favorites'>
             <FormattedNumber value={status.get('favourites_count')} />
           </span>
@@ -181,7 +182,7 @@ export default class DetailedStatus extends ImmutablePureComponent {
     } else {
       favouriteLink = (
         <a href={`/interact/${status.get('id')}?type=favourite`} className='detailed-status__link' onClick={this.handleModalLink}>
-          <i className='fa fa-star' />
+          <Icon id='star' />
           <span className='detailed-status__favorites'>
             <FormattedNumber value={status.get('favourites_count')} />
           </span>
diff --git a/app/javascript/mastodon/features/status/index.js b/app/javascript/mastodon/features/status/index.js
index d48b682eb..3b5febcac 100644
--- a/app/javascript/mastodon/features/status/index.js
+++ b/app/javascript/mastodon/features/status/index.js
@@ -44,6 +44,7 @@ import { HotKeys } from 'react-hotkeys';
 import { boostModal, deleteModal } from '../../initial_state';
 import { attachFullscreenListener, detachFullscreenListener, isFullscreen } from '../ui/util/fullscreen';
 import { textForScreenReader } from '../../components/status';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   deleteConfirm: { id: 'confirmations.delete.confirm', defaultMessage: 'Delete' },
@@ -425,7 +426,7 @@ class Status extends ImmutablePureComponent {
         <ColumnHeader
           showBackButton
           extraButton={(
-            <button className='column-header__button' title={intl.formatMessage(status.get('hidden') ? messages.revealAll : messages.hideAll)} aria-label={intl.formatMessage(status.get('hidden') ? messages.revealAll : messages.hideAll)} onClick={this.handleToggleAll} aria-pressed={status.get('hidden') ? 'false' : 'true'}><i className={`fa fa-${status.get('hidden') ? 'eye-slash' : 'eye'}`} /></button>
+            <button className='column-header__button' title={intl.formatMessage(status.get('hidden') ? messages.revealAll : messages.hideAll)} aria-label={intl.formatMessage(status.get('hidden') ? messages.revealAll : messages.hideAll)} onClick={this.handleToggleAll} aria-pressed={status.get('hidden') ? 'false' : 'true'}><Icon id={status.get('hidden') ? 'eye-slash' : 'eye'} /></button>
           )}
         />
 
diff --git a/app/javascript/mastodon/features/ui/components/boost_modal.js b/app/javascript/mastodon/features/ui/components/boost_modal.js
index b128e67d2..920e93d40 100644
--- a/app/javascript/mastodon/features/ui/components/boost_modal.js
+++ b/app/javascript/mastodon/features/ui/components/boost_modal.js
@@ -8,6 +8,7 @@ import Avatar from '../../../components/avatar';
 import RelativeTimestamp from '../../../components/relative_timestamp';
 import DisplayName from '../../../components/display_name';
 import ImmutablePureComponent from 'react-immutable-pure-component';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   reblog: { id: 'status.reblog', defaultMessage: 'Boost' },
@@ -74,7 +75,7 @@ class BoostModal extends ImmutablePureComponent {
         </div>
 
         <div className='boost-modal__action-bar'>
-          <div><FormattedMessage id='boost_modal.combo' defaultMessage='You can press {combo} to skip this next time' values={{ combo: <span>Shift + <i className='fa fa-retweet' /></span> }} /></div>
+          <div><FormattedMessage id='boost_modal.combo' defaultMessage='You can press {combo} to skip this next time' values={{ combo: <span>Shift + <Icon id='retweet' /></span> }} /></div>
           <Button text={intl.formatMessage(messages.reblog)} onClick={this.handleReblog} ref={this.setRef} />
         </div>
       </div>
diff --git a/app/javascript/mastodon/features/ui/components/column_header.js b/app/javascript/mastodon/features/ui/components/column_header.js
index e8bdd8054..b1a36e173 100644
--- a/app/javascript/mastodon/features/ui/components/column_header.js
+++ b/app/javascript/mastodon/features/ui/components/column_header.js
@@ -1,6 +1,7 @@
 import React from 'react';
 import PropTypes from 'prop-types';
 import classNames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 export default class ColumnHeader extends React.PureComponent {
 
@@ -21,7 +22,7 @@ export default class ColumnHeader extends React.PureComponent {
     let iconElement = '';
 
     if (icon) {
-      iconElement = <i className={`fa fa-fw fa-${icon} column-header__icon`} />;
+      iconElement = <Icon id={icon} fixedWidth className='column-header__icon' />;
     }
 
     return (
diff --git a/app/javascript/mastodon/features/ui/components/column_link.js b/app/javascript/mastodon/features/ui/components/column_link.js
index 25c2d1cf8..0a25f1ea2 100644
--- a/app/javascript/mastodon/features/ui/components/column_link.js
+++ b/app/javascript/mastodon/features/ui/components/column_link.js
@@ -1,6 +1,7 @@
 import React from 'react';
 import PropTypes from 'prop-types';
 import { Link } from 'react-router-dom';
+import Icon from 'mastodon/components/icon';
 
 const ColumnLink = ({ icon, text, to, href, method, badge }) => {
   const badgeElement = typeof badge !== 'undefined' ? <span className='column-link__badge'>{badge}</span> : null;
@@ -8,7 +9,7 @@ const ColumnLink = ({ icon, text, to, href, method, badge }) => {
   if (href) {
     return (
       <a href={href} className='column-link' data-method={method}>
-        <i className={`fa fa-fw fa-${icon} column-link__icon`} />
+        <Icon id={icon} fixedWidth className='column-link__icon' />
         {text}
         {badgeElement}
       </a>
@@ -16,7 +17,7 @@ const ColumnLink = ({ icon, text, to, href, method, badge }) => {
   } else {
     return (
       <Link to={to} className='column-link'>
-        <i className={`fa fa-fw fa-${icon} column-link__icon`} />
+        <Icon id={icon} fixedWidth className='column-link__icon' />
         {text}
         {badgeElement}
       </Link>
diff --git a/app/javascript/mastodon/features/ui/components/columns_area.js b/app/javascript/mastodon/features/ui/components/columns_area.js
index b7e350cbc..63feeac45 100644
--- a/app/javascript/mastodon/features/ui/components/columns_area.js
+++ b/app/javascript/mastodon/features/ui/components/columns_area.js
@@ -13,6 +13,7 @@ import ColumnLoading from './column_loading';
 import DrawerLoading from './drawer_loading';
 import BundleColumnError from './bundle_column_error';
 import { Compose, Notifications, HomeTimeline, CommunityTimeline, PublicTimeline, HashtagTimeline, DirectTimeline, FavouritedStatuses, ListTimeline } from '../../ui/util/async-components';
+import Icon from 'mastodon/components/icon';
 
 import detectPassiveEvents from 'detect-passive-events';
 import { scrollRight } from '../../../scroll';
@@ -160,7 +161,7 @@ class ColumnsArea extends ImmutablePureComponent {
     this.pendingIndex = null;
 
     if (singleColumn) {
-      const floatingActionButton = shouldHideFAB(this.context.router.history.location.pathname) ? null : <Link key='floating-action-button' to='/statuses/new' className='floating-action-button' aria-label={intl.formatMessage(messages.publish)}><i className='fa fa-pencil' /></Link>;
+      const floatingActionButton = shouldHideFAB(this.context.router.history.location.pathname) ? null : <Link key='floating-action-button' to='/statuses/new' className='floating-action-button' aria-label={intl.formatMessage(messages.publish)}><Icon id='pencil' /></Link>;
 
       return columnIndex !== -1 ? [
         <ReactSwipeableViews key='content' index={columnIndex} onChangeIndex={this.handleSwipe} onTransitionEnd={this.handleAnimationEnd} animateTransitions={shouldAnimate} springConfig={{ duration: '400ms', delay: '0s', easeFunction: 'ease' }} style={{ height: '100%' }}>
diff --git a/app/javascript/mastodon/features/ui/components/media_modal.js b/app/javascript/mastodon/features/ui/components/media_modal.js
index d29a4a6a7..2120746da 100644
--- a/app/javascript/mastodon/features/ui/components/media_modal.js
+++ b/app/javascript/mastodon/features/ui/components/media_modal.js
@@ -9,6 +9,7 @@ import { defineMessages, injectIntl } from 'react-intl';
 import IconButton from '../../../components/icon_button';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import ImageLoader from './image_loader';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   close: { id: 'lightbox.close', defaultMessage: 'Close' },
@@ -108,8 +109,8 @@ class MediaModal extends ImmutablePureComponent {
     const index = this.getIndex();
     let pagination = [];
 
-    const leftNav  = media.size > 1 && <button tabIndex='0' className='media-modal__nav media-modal__nav--left' onClick={this.handlePrevClick} aria-label={intl.formatMessage(messages.previous)}><i className='fa fa-fw fa-chevron-left' /></button>;
-    const rightNav = media.size > 1 && <button tabIndex='0' className='media-modal__nav  media-modal__nav--right' onClick={this.handleNextClick} aria-label={intl.formatMessage(messages.next)}><i className='fa fa-fw fa-chevron-right' /></button>;
+    const leftNav  = media.size > 1 && <button tabIndex='0' className='media-modal__nav media-modal__nav--left' onClick={this.handlePrevClick} aria-label={intl.formatMessage(messages.previous)}><Icon id='chevron-left' fixedWidth /></button>;
+    const rightNav = media.size > 1 && <button tabIndex='0' className='media-modal__nav  media-modal__nav--right' onClick={this.handleNextClick} aria-label={intl.formatMessage(messages.next)}><Icon id='chevron-right' fixedWidth /></button>;
 
     if (media.size > 1) {
       pagination = media.map((item, i) => {
diff --git a/app/javascript/mastodon/features/ui/components/tabs_bar.js b/app/javascript/mastodon/features/ui/components/tabs_bar.js
index 16236ea51..1b2bb7781 100644
--- a/app/javascript/mastodon/features/ui/components/tabs_bar.js
+++ b/app/javascript/mastodon/features/ui/components/tabs_bar.js
@@ -4,16 +4,17 @@ import { NavLink, withRouter } from 'react-router-dom';
 import { FormattedMessage, injectIntl } from 'react-intl';
 import { debounce } from 'lodash';
 import { isUserTouching } from '../../../is_mobile';
+import Icon from 'mastodon/components/icon';
 
 export const links = [
-  <NavLink className='tabs-bar__link primary' to='/timelines/home' data-preview-title-id='column.home' data-preview-icon='home' ><i className='fa fa-fw fa-home' /><FormattedMessage id='tabs_bar.home' defaultMessage='Home' /></NavLink>,
-  <NavLink className='tabs-bar__link primary' to='/notifications' data-preview-title-id='column.notifications' data-preview-icon='bell' ><i className='fa fa-fw fa-bell' /><FormattedMessage id='tabs_bar.notifications' defaultMessage='Notifications' /></NavLink>,
+  <NavLink className='tabs-bar__link primary' to='/timelines/home' data-preview-title-id='column.home' data-preview-icon='home' ><Icon id='home' fixedWidth /><FormattedMessage id='tabs_bar.home' defaultMessage='Home' /></NavLink>,
+  <NavLink className='tabs-bar__link primary' to='/notifications' data-preview-title-id='column.notifications' data-preview-icon='bell' ><Icon id='bell' fixedWidth /><FormattedMessage id='tabs_bar.notifications' defaultMessage='Notifications' /></NavLink>,
 
-  <NavLink className='tabs-bar__link secondary' to='/timelines/public/local' data-preview-title-id='column.community' data-preview-icon='users' ><i className='fa fa-fw fa-users' /><FormattedMessage id='tabs_bar.local_timeline' defaultMessage='Local' /></NavLink>,
-  <NavLink className='tabs-bar__link secondary' exact to='/timelines/public' data-preview-title-id='column.public' data-preview-icon='globe' ><i className='fa fa-fw fa-globe' /><FormattedMessage id='tabs_bar.federated_timeline' defaultMessage='Federated' /></NavLink>,
-  <NavLink className='tabs-bar__link primary' to='/search' data-preview-title-id='tabs_bar.search' data-preview-icon='bell' ><i className='fa fa-fw fa-search' /><FormattedMessage id='tabs_bar.search' defaultMessage='Search' /></NavLink>,
+  <NavLink className='tabs-bar__link secondary' to='/timelines/public/local' data-preview-title-id='column.community' data-preview-icon='users' ><Icon id='users' fixedWidth /><FormattedMessage id='tabs_bar.local_timeline' defaultMessage='Local' /></NavLink>,
+  <NavLink className='tabs-bar__link secondary' exact to='/timelines/public' data-preview-title-id='column.public' data-preview-icon='globe' ><Icon id='globe' fixedWidth /><FormattedMessage id='tabs_bar.federated_timeline' defaultMessage='Federated' /></NavLink>,
+  <NavLink className='tabs-bar__link primary' to='/search' data-preview-title-id='tabs_bar.search' data-preview-icon='bell' ><Icon id='search' fixedWidth /><FormattedMessage id='tabs_bar.search' defaultMessage='Search' /></NavLink>,
 
-  <NavLink className='tabs-bar__link primary' style={{ flexGrow: '0', flexBasis: '30px' }} to='/getting-started' data-preview-title-id='getting_started.heading' data-preview-icon='bars' ><i className='fa fa-fw fa-bars' /></NavLink>,
+  <NavLink className='tabs-bar__link primary' style={{ flexGrow: '0', flexBasis: '30px' }} to='/getting-started' data-preview-title-id='getting_started.heading' data-preview-icon='bars' ><Icon id='bars' fixedWidth /></NavLink>,
 ];
 
 export function getIndex (path) {
diff --git a/app/javascript/mastodon/features/video/index.js b/app/javascript/mastodon/features/video/index.js
index 0d0c24d71..15a5de4b8 100644
--- a/app/javascript/mastodon/features/video/index.js
+++ b/app/javascript/mastodon/features/video/index.js
@@ -6,6 +6,7 @@ import { throttle } from 'lodash';
 import classNames from 'classnames';
 import { isFullscreen, requestFullscreen, exitFullscreen } from '../ui/util/fullscreen';
 import { displayMedia } from '../../initial_state';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   play: { id: 'video.play', defaultMessage: 'Play' },
@@ -416,8 +417,8 @@ class Video extends React.PureComponent {
 
           <div className='video-player__buttons-bar'>
             <div className='video-player__buttons left'>
-              <button type='button' aria-label={intl.formatMessage(paused ? messages.play : messages.pause)} onClick={this.togglePlay}><i className={classNames('fa fa-fw', { 'fa-play': paused, 'fa-pause': !paused })} /></button>
-              <button type='button' aria-label={intl.formatMessage(muted ? messages.unmute : messages.mute)} onClick={this.toggleMute}><i className={classNames('fa fa-fw', { 'fa-volume-off': muted, 'fa-volume-up': !muted })} /></button>
+              <button type='button' aria-label={intl.formatMessage(paused ? messages.play : messages.pause)} onClick={this.togglePlay}><Icon id={paused ? 'play' : 'pause'} fixedWidth /></button>
+              <button type='button' aria-label={intl.formatMessage(muted ? messages.unmute : messages.mute)} onClick={this.toggleMute}><Icon id={muted ? 'volume-off' : 'volume-up'} fixedWidth /></button>
               <div className='video-player__volume' onMouseDown={this.handleVolumeMouseDown} ref={this.setVolumeRef}>
                 <div className='video-player__volume__current' style={{ width: `${volumeWidth}px` }} />
                 <span
@@ -437,10 +438,10 @@ class Video extends React.PureComponent {
             </div>
 
             <div className='video-player__buttons right'>
-              {!onCloseVideo && <button type='button' aria-label={intl.formatMessage(messages.hide)} onClick={this.toggleReveal}><i className='fa fa-fw fa-eye' /></button>}
-              {(!fullscreen && onOpenVideo) && <button type='button' aria-label={intl.formatMessage(messages.expand)} onClick={this.handleOpenVideo}><i className='fa fa-fw fa-expand' /></button>}
-              {onCloseVideo && <button type='button' aria-label={intl.formatMessage(messages.close)} onClick={this.handleCloseVideo}><i className='fa fa-fw fa-compress' /></button>}
-              <button type='button' aria-label={intl.formatMessage(fullscreen ? messages.exit_fullscreen : messages.fullscreen)} onClick={this.toggleFullscreen}><i className={classNames('fa fa-fw', { 'fa-arrows-alt': !fullscreen, 'fa-compress': fullscreen })} /></button>
+              {!onCloseVideo && <button type='button' aria-label={intl.formatMessage(messages.hide)} onClick={this.toggleReveal}><Icon id='eye' fixedWidth /></button>}
+              {(!fullscreen && onOpenVideo) && <button type='button' aria-label={intl.formatMessage(messages.expand)} onClick={this.handleOpenVideo}><Icon id='expand' fixedWidth /></button>}
+              {onCloseVideo && <button type='button' aria-label={intl.formatMessage(messages.close)} onClick={this.handleCloseVideo}><Icon id='compress' fixedWidth /></button>}
+              <button type='button' aria-label={intl.formatMessage(fullscreen ? messages.exit_fullscreen : messages.fullscreen)} onClick={this.toggleFullscreen}><Icon id={fullscreen ? 'compress' : 'arrows-alt'} fixedWidth /></button>
             </div>
           </div>
         </div>
diff --git a/app/javascript/styles/contrast/diff.scss b/app/javascript/styles/contrast/diff.scss
index eee9ecc3e..7d8993a50 100644
--- a/app/javascript/styles/contrast/diff.scss
+++ b/app/javascript/styles/contrast/diff.scss
@@ -12,3 +12,54 @@
     }
   }
 }
+
+.status__content a,
+.reply-indicator__content a {
+  color: lighten($ui-highlight-color, 12%);
+  text-decoration: underline;
+
+  &.mention {
+    text-decoration: none;
+  }
+
+  &.mention span {
+    text-decoration: underline;
+
+    &:hover,
+    &:focus,
+    &:active {
+      text-decoration: none;
+    }
+  }
+
+  &:hover,
+  &:focus,
+  &:active {
+    text-decoration: none;
+  }
+
+  &.status__content__spoiler-link {
+    color: $secondary-text-color;
+    text-decoration: none;
+  }
+}
+
+.status__content__read-more-button {
+  text-decoration: underline;
+
+  &:hover,
+  &:focus,
+  &:active {
+    text-decoration: none;
+  }
+}
+
+.getting-started__footer a {
+  text-decoration: underline;
+
+  &:hover,
+  &:focus,
+  &:active {
+    text-decoration: none;
+  }
+}
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 8cc9d7c0b..b8d80a748 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -566,8 +566,8 @@ en:
       other: "%{count} people"
   errors:
     '403': You don't have permission to view this page.
-    '404': The page you were looking for doesn't exist.
-    '410': The page you were looking for doesn't exist anymore.
+    '404': The page you are looking for isn't here.
+    '410': The page you were looking for doesn't exist here anymore.
     '422':
       content: Security verification failed. Are you blocking cookies?
       title: Security verification failed
@@ -580,7 +580,7 @@ en:
     archive_takeout:
       date: Date
       download: Download your archive
-      hint_html: You can request an archive of your <strong>toots and uploaded media</strong>. The exported data will be in ActivityPub format, readable by any compliant software. You can request an archive every 7 days.
+      hint_html: You can request an archive of your <strong>toots and uploaded media</strong>. The exported data will be in the ActivityPub format, readable by any compliant software. You can request an archive every 7 days.
       in_progress: Compiling your archive...
       request: Request your archive
       size: Size
@@ -934,9 +934,9 @@ en:
       <p>Originally adapted from the <a href="https://github.com/discourse/discourse">Discourse privacy policy</a>.</p>
     title: "%{instance} Terms of Service and Privacy Policy"
   themes:
-    contrast: High contrast
-    default: Mastodon
-    mastodon-light: Mastodon (light)
+    contrast: Mastodon (High contrast)
+    default: Mastodon (Dark)
+    mastodon-light: Mastodon (Light)
   time:
     formats:
       default: "%b %d, %Y, %H:%M"
diff --git a/config/locales/pl.yml b/config/locales/pl.yml
index 9f457a460..23fa10179 100644
--- a/config/locales/pl.yml
+++ b/config/locales/pl.yml
@@ -565,8 +565,11 @@ pl:
     warning_title: Dostępność usuniętej zawartości
   directories:
     directory: Katalog profilów
+    enabled: Jesteś obecnie zapisany(-a) do katalogu
+    enabled_but_waiting: Jesteś zapisany(-a) do katalogu, ale jeszcze nie śledzi Cię wystarczająca liczba osób (%{min_followers}), aby się tam pojawić.
     explanation: Poznaj profile na podstawie zainteresowań
     explore_mastodon: Odkrywaj %{title}
+    how_to_enable: Nie jesteś obecnie zapisany(-a) do katalogu. Poniżej możesz zapisać się. Użyj hashtagów w swoim opisie, aby zostać wyświetlonym pod określonymi hashtagami!
     people:
       few: "%{count} osoby"
       many: "%{count} osób"
@@ -621,7 +624,11 @@ pl:
     followers_count: Liczba śledzących
     lock_link: Zablokuj swoje konto
     purge: Przestań śledzić
-    success: W trakcie usuwania śledzących z %{count} domen…
+    success:
+      few: W trakcie usuwania śledzących z %{count} domen…
+      many: W trakcie usuwania śledzących z %{count} domen…
+      one: W trakcie usuwania śledzących z jednej domeny…
+      other: W trakcie usuwania śledzących z %{count} domen…
     true_privacy_html: Pamiętaj, że <strong>rzeczywista prywatność może zostać uzyskana wyłącznie dzięki szyfrowaniu end-to-end</strong>.
     unlocked_warning_html: Każdy może Cię śledzić, dzięki czemu może zobaczyć Twoje niepubliczne wpisy. %{lock_link} aby móc kontrolować, kto Cię śledzi.
     unlocked_warning_title: Twoje konto nie jest zablokowane
@@ -631,6 +638,7 @@ pl:
     resources: Zasoby
   generic:
     changes_saved_msg: Ustawienia zapisane!
+    copy: Kopiuj
     save_changes: Zapisz zmiany
     use_this: Użyj tego
     validation_errors:
@@ -751,10 +759,25 @@ pl:
     no_account_html: Nie masz konta? Możesz <a href='%{sign_up_path}' target='_blank'>zarejestrować się tutaj</a>
     proceed: Śledź
     prompt: 'Zamierzasz śledzić:'
+    reason_html: "<strong>Dlaczego ten krok jest konieczny?</strong> <code>%{instance}</code> może nie być serwerem na którym jesteś zarejestrowany(-a), więc musisz zostać przekierowany(-a) na swój serwer."
+  remote_interaction:
+    favourite:
+      proceed: Przejdź do dodania do ulubionych
+      prompt: 'Chcesz dodać ten wpis do ulubionych:'
+    reblog:
+      proceed: Przejdź do podbicia
+      prompt: 'Chcesz podbić ten wpis:'
+    reply:
+      proceed: Przejdź do dodawania odpowiedzi
+      prompt: 'Chcesz odpowiedzieć na ten wpis:'
   remote_unfollow:
     error: Błąd
     title: Tytuł
-    unfollowed: Przestałeś śledzić
+    unfollowed: Przestałeś(-aś) śledzić
+  scheduled_statuses:
+    over_daily_limit: Przekroczyłeś(-aś) limit %{limit} zaplanowanych wpisów na ten dzień
+    over_total_limit: Przekroczyłeś(-aś) limit %{limit} zaplanowanych wpisów
+    too_soon: Zaplanowana data musi wypadać w przyszłości
   sessions:
     activity: Ostatnia aktywność
     browser: Przeglądarka
@@ -827,7 +850,11 @@ pl:
         other: "%{count} filmów"
     boosted_from_html: Podbito przez %{acct_link}
     content_warning: 'Ostrzeżenie o zawartości: %{warning}'
-    disallowed_hashtags: 'zawiera niedozwolone hashtagi: %{tags}'
+    disallowed_hashtags:
+      few: 'zawiera niedozwolone hashtagi: %{tags}'
+      many: 'zawiera niedozwolone hashtagi: %{tags}'
+      one: 'zawiera niedozwolony hashtag: %{tags}'
+      other: 'zawiera niedozwolone hashtagi: %{tags}'
     language_detection: Automatycznie wykrywaj język
     open_in_web: Otwórz w przeglądarce
     over_character_limit: limit %{max} znaków przekroczony
diff --git a/config/locales/sk.yml b/config/locales/sk.yml
index d0f2524f9..393e1ae93 100644
--- a/config/locales/sk.yml
+++ b/config/locales/sk.yml
@@ -64,7 +64,7 @@ sk:
     posts:
       few: Príspevkov
       one: Príspevok
-      other: Príspevkov
+      other: Príspevky
     posts_tab_heading: Príspevky
     posts_with_replies: Príspevky s odpoveďami
     reserved_username: Prihlasovacie meno je rezervované
@@ -122,7 +122,7 @@ sk:
         local: Miestne
         remote: Federované
         title: Lokácia
-      login_status: Status prihlásenia
+      login_status: Stav prihlásenia
       media_attachments: Prílohy
       memorialize: Zmeniť na "Navždy budeme spomínať"
       moderation:
@@ -139,7 +139,7 @@ sk:
       outbox_url: URL poslaných
       perform_full_suspension: Zablokovať
       profile_url: URL profilu
-      promote: Povýšiť
+      promote: Povýš
       protocol: Protokol
       public: Verejná os
       push_subscription_expires: PuSH odoberanie expiruje
@@ -256,7 +256,7 @@ sk:
       title: Spravovacie rozhranie
       total_users: užívateľov celkovo
       trends: Trendy
-      week_interactions: Tohto týždňové interakcie
+      week_interactions: Tohto-týždňové interakcie
       week_users_active: aktívni tento týždeň
       week_users_new: užívateľov počas tohto týždňa
     domain_blocks:
@@ -271,7 +271,7 @@ sk:
           desc_html: "<strong>Stíšenie</strong> urobí všetky príspevky daného účtu neviditeľné pre všetkých ktorí nenásledujú tento účet. <strong>Suspendácia</strong> zmaže všetky príspevky, médiá a profilové informácie. Použi <strong>Žiadne</strong>, ak chceš iba neprijímať súbory médií."
           noop: Nič
           silence: Stíšiť
-          suspend: Suspendovať
+          suspend: Vylúčiť
         title: Nové blokovanie domény
       reject_media: Odmietať súbory s obrázkami alebo videami
       reject_media_hint: Zmaže lokálne uložené súbory médií a odmietne ich sťahovanie v budúcnosti. Irelevantné pre suspendáciu
@@ -488,10 +488,10 @@ sk:
   application_mailer:
     notification_preferences: Zmeniť e-mailové voľby
     salutation: "%{name},"
-    settings: 'Zmeniť e-mailové voľby: %{link}'
+    settings: 'Zmeň emailové voľby: %{link}'
     view: 'Zobraziť:'
-    view_profile: Zobraziť profil
-    view_status: Zobraziť status
+    view_profile: Zobraz profil
+    view_status: Zobraz status
   applications:
     created: Aplikácia bola vytvorená úspešne
     destroyed: Aplikáciu sa podarilo odstrániť
@@ -570,16 +570,16 @@ sk:
       other: "%{count} ľudia"
   errors:
     '403': Nemáš povolenie na zobrazenie tejto stránky.
-    '404': Stránka ktorú si hľadal/a sa tu nenachádza.
-    '410': Stránka ktorú si tu hľadal/a už viac neexistuje.
+    '404': Stránka ktorú hľadáš nieje tu.
+    '410': Stránka ktorú si tu hľadal/a sa tu už viac nenachádza.
     '422':
       content: Bezpečtnostné overenie zlyhalo. Blokuješ cookies?
       title: Bezpečtnostné overenie zlyhalo
     '429': Zamlčané
     '500':
-      content: Ospravedlňujeme sa. Niečo sa pokazilo na našom konci.
+      content: Ospravedlňujem sa. Niečo sa pokazilo na našom konci.
       title: Táto stránka nieje v poriadku
-    noscript_html: Aby bolo možné používať Mastodon web aplikáciu, prosím povoľte JavaScript. Alebo skúste jednu z <a href="%{apps_path}"> aplikácii </a> dostupných pre vašu platformu.
+    noscript_html: Aby bolo možné používať Mastodon web aplikáciu, povoľ prosím JavaScript. Alebo skús jednu z <a href="%{apps_path}"> aplikácii </a> dostupných pre vašu platformu.
   exports:
     archive_takeout:
       date: Dátum
@@ -607,7 +607,7 @@ sk:
       invalid_context: Nebola poskytnutá žiadna, alebo ide o neplatnú súvislosť
       invalid_irreversible: Nezvratné filtrovanie funguje iba so súvislostiami domovskej osi a oboznámení
     index:
-      delete: Vymazať
+      delete: Vymaž
       title: Triedenia
     new:
       title: Pridaj nové triedenie
@@ -615,8 +615,8 @@ sk:
     domain: Doména
     explanation_html: Pokiaľ chceš zaručiť súkromie svojích príspevkov, musíš mať na vedomí, kto ťa sleduje. <strong> Tvoje súkromné príspevky sú doručené na každý server z ktorého ťa niekto následuje. </strong> Takže možno by si ich chcel/a skontrolovať, a odstrániť tých následovníkov, čo sú na serveroch ktorím nedôveruješ, že ich moderátori, alebo úpravbuy kódu budú tiež rešpektovať tvoje súkromie.
     followers_count: Počet následovateľov
-    lock_link: Zamknite svoj účet
-    purge: Odstrániť následovateľa
+    lock_link: Zamkni svoj účet
+    purge: Odstráň sledovateľa
     success:
       few: Počas utišovania sledovateľov z %{count} domén...
       one: Počas utišovania sledovateľov z jednej domény...
@@ -630,7 +630,7 @@ sk:
     resources: Podklady
   generic:
     changes_saved_msg: Zmeny boli úspešne uložené!
-    copy: Kopírovať
+    copy: Kopíruj
     save_changes: Ulož zmeny
     validation_errors:
       few: Niečo ešte stále nieje v poriadku! Prosím skontroluj všetky %{count} chyby
@@ -741,8 +741,8 @@ sk:
     web: Web
   remote_follow:
     acct: Napíš svoju prezývku@doménu z ktorej chceš následovať
-    missing_resource: Nemôžeme nájsť potrebnú presmerovaciu adresu k tvojmu účtu
-    no_account_html: Nemáš ešte účet? Môžeš sa <a href='%{sign_up_path}' target='_blank'>zaregistrovať tu</a>
+    missing_resource: Nemožno nájsť potrebnú presmerovaciu adresu k tvojmu účtu
+    no_account_html: Nemáš účet? Môžeš sa <a href='%{sign_up_path}' target='_blank'>zaregistrovať tu</a>
     proceed: Začni následovať
     prompt: 'Budeš sledovať:'
     reason_html: "<strong>Načo je tento krok potrebný?</strong> <code>%{instance}</code> nemusí byť práve tým serverom na ktorom si zaregistrovaný/á, takže je ťa najprv potrebné presmerovať na tvoj domáci server."
diff --git a/jest.config.js b/jest.config.js
index dc61b9a9d..ae6c96f33 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -23,4 +23,8 @@ module.exports = {
     '!app/javascript/mastodon/test_setup.js',
   ],
   coverageDirectory: '<rootDir>/coverage',
+  moduleDirectories: [
+    '<rootDir>/node_modules',
+    '<rootDir>/app/javascript',
+  ],
 };