diff --git a/app/javascript/flavours/glitch/components/admin/ReportReasonSelector.jsx b/app/javascript/flavours/glitch/components/admin/ReportReasonSelector.jsx
index 8478ba3662..ecefe7a840 100644
--- a/app/javascript/flavours/glitch/components/admin/ReportReasonSelector.jsx
+++ b/app/javascript/flavours/glitch/components/admin/ReportReasonSelector.jsx
@@ -33,7 +33,7 @@ class Category extends React.PureComponent {
     const { id, text, disabled, selected, children } = this.props;
 
     return (
-      <div tabIndex='0' role='button' className={classNames('report-reason-selector__category', { selected, disabled })} onClick={this.handleClick}>
+      <div tabIndex={0} role='button' className={classNames('report-reason-selector__category', { selected, disabled })} onClick={this.handleClick}>
         {selected && <input type='hidden' name='report[category]' value={id} />}
 
         <div className='report-reason-selector__category__label'>
@@ -74,7 +74,7 @@ class Rule extends React.PureComponent {
     const { id, text, disabled, selected } = this.props;
 
     return (
-      <div tabIndex='0' role='button' className={classNames('report-reason-selector__rule', { selected, disabled })} onClick={this.handleClick}>
+      <div tabIndex={0} role='button' className={classNames('report-reason-selector__rule', { selected, disabled })} onClick={this.handleClick}>
         <span className={classNames('poll__input', { checkbox: true, active: selected, disabled })} />
         {selected && <input type='hidden' name='report[rule_ids][]' value={id} />}
         {text}
diff --git a/app/javascript/flavours/glitch/components/autosuggest_input.jsx b/app/javascript/flavours/glitch/components/autosuggest_input.jsx
index 90ff298c0d..ea9fd0828a 100644
--- a/app/javascript/flavours/glitch/components/autosuggest_input.jsx
+++ b/app/javascript/flavours/glitch/components/autosuggest_input.jsx
@@ -180,7 +180,7 @@ export default class AutosuggestInput extends ImmutablePureComponent {
     }
 
     return (
-      <div role='button' tabIndex='0' key={key} data-index={i} className={classNames('autosuggest-textarea__suggestions__item', { selected: i === selectedSuggestion })} onMouseDown={this.onSuggestionClick}>
+      <div role='button' tabIndex={0} key={key} data-index={i} className={classNames('autosuggest-textarea__suggestions__item', { selected: i === selectedSuggestion })} onMouseDown={this.onSuggestionClick}>
         {inner}
       </div>
     );
diff --git a/app/javascript/flavours/glitch/components/autosuggest_textarea.jsx b/app/javascript/flavours/glitch/components/autosuggest_textarea.jsx
index 6e6e567b93..a016e44b72 100644
--- a/app/javascript/flavours/glitch/components/autosuggest_textarea.jsx
+++ b/app/javascript/flavours/glitch/components/autosuggest_textarea.jsx
@@ -186,7 +186,7 @@ export default class AutosuggestTextarea extends ImmutablePureComponent {
     }
 
     return (
-      <div role='button' tabIndex='0' key={key} data-index={i} className={classNames('autosuggest-textarea__suggestions__item', { selected: i === selectedSuggestion })} onMouseDown={this.onSuggestionClick}>
+      <div role='button' tabIndex={0} key={key} data-index={i} className={classNames('autosuggest-textarea__suggestions__item', { selected: i === selectedSuggestion })} onMouseDown={this.onSuggestionClick}>
         {inner}
       </div>
     );
diff --git a/app/javascript/flavours/glitch/components/column_back_button_slim.jsx b/app/javascript/flavours/glitch/components/column_back_button_slim.jsx
index b43d85b3b0..4df045b5fb 100644
--- a/app/javascript/flavours/glitch/components/column_back_button_slim.jsx
+++ b/app/javascript/flavours/glitch/components/column_back_button_slim.jsx
@@ -26,7 +26,7 @@ export default class ColumnBackButtonSlim extends React.PureComponent {
   render () {
     return (
       <div className='column-back-button--slim'>
-        <div role='button' tabIndex='0' onClick={this.handleClick} className='column-back-button column-back-button--slim-button'>
+        <div role='button' tabIndex={0} onClick={this.handleClick} className='column-back-button column-back-button--slim-button'>
           <Icon id='chevron-left' className='column-back-button__icon' fixedWidth />
           <FormattedMessage id='column_back_button.label' defaultMessage='Back' />
         </div>
diff --git a/app/javascript/flavours/glitch/components/dropdown_menu.jsx b/app/javascript/flavours/glitch/components/dropdown_menu.jsx
index f4b6e059fc..7fb75b59ea 100644
--- a/app/javascript/flavours/glitch/components/dropdown_menu.jsx
+++ b/app/javascript/flavours/glitch/components/dropdown_menu.jsx
@@ -119,7 +119,7 @@ class DropdownMenu extends React.PureComponent {
 
     return (
       <li className='dropdown-menu__item' key={`${text}-${i}`}>
-        <a href={href} target={target} data-method={method} rel='noopener noreferrer' role='button' tabIndex='0' ref={i === 0 ? this.setFocusRef : null} onClick={this.handleClick} onKeyPress={this.handleItemKeyPress} data-index={i}>
+        <a href={href} target={target} data-method={method} rel='noopener noreferrer' role='button' tabIndex={0} ref={i === 0 ? this.setFocusRef : null} onClick={this.handleClick} onKeyPress={this.handleItemKeyPress} data-index={i}>
           {text}
         </a>
       </li>
diff --git a/app/javascript/flavours/glitch/components/error_boundary.jsx b/app/javascript/flavours/glitch/components/error_boundary.jsx
index 8518dfc866..234a53417f 100644
--- a/app/javascript/flavours/glitch/components/error_boundary.jsx
+++ b/app/javascript/flavours/glitch/components/error_boundary.jsx
@@ -72,7 +72,7 @@ export default class ErrorBoundary extends React.PureComponent {
     }
 
     return (
-      <div tabIndex='-1'>
+      <div tabIndex={-1}>
         <div className='error-boundary'>
           <h1><FormattedMessage id='web_app_crash.title' defaultMessage="We're sorry, but something went wrong with the Mastodon app." /></h1>
           <p>
diff --git a/app/javascript/flavours/glitch/components/gifv.jsx b/app/javascript/flavours/glitch/components/gifv.jsx
index 9ec201c6cc..1ce7e7c29b 100644
--- a/app/javascript/flavours/glitch/components/gifv.jsx
+++ b/app/javascript/flavours/glitch/components/gifv.jsx
@@ -46,7 +46,7 @@ export default class GIFV extends React.PureComponent {
             width={width}
             height={height}
             role='button'
-            tabIndex='0'
+            tabIndex={0}
             aria-label={alt}
             title={alt}
             lang={lang}
@@ -57,7 +57,7 @@ export default class GIFV extends React.PureComponent {
         <video
           src={src}
           role='button'
-          tabIndex='0'
+          tabIndex={0}
           aria-label={alt}
           title={alt}
           lang={lang}
diff --git a/app/javascript/flavours/glitch/components/intersection_observer_article.jsx b/app/javascript/flavours/glitch/components/intersection_observer_article.jsx
index 77cd663587..6c00e557d0 100644
--- a/app/javascript/flavours/glitch/components/intersection_observer_article.jsx
+++ b/app/javascript/flavours/glitch/components/intersection_observer_article.jsx
@@ -120,7 +120,7 @@ export default class IntersectionObserverArticle extends React.Component {
         aria-posinset={index + 1}
         aria-setsize={listLength}
         data-id={id}
-        tabIndex='0'
+        tabIndex={0}
         style={style}
       >
         {children && React.cloneElement(children, { hidden: !isIntersecting && (isHidden || !!cachedHeight) })}
diff --git a/app/javascript/flavours/glitch/components/picture_in_picture_placeholder.jsx b/app/javascript/flavours/glitch/components/picture_in_picture_placeholder.jsx
index 961d3deadd..9d1b7f55a2 100644
--- a/app/javascript/flavours/glitch/components/picture_in_picture_placeholder.jsx
+++ b/app/javascript/flavours/glitch/components/picture_in_picture_placeholder.jsx
@@ -58,7 +58,7 @@ class PictureInPicturePlaceholder extends React.PureComponent {
     const { height } = this.state;
 
     return (
-      <div ref={this.setRef} className='picture-in-picture-placeholder' style={{ height }} role='button' tabIndex='0' onClick={this.handleClick}>
+      <div ref={this.setRef} className='picture-in-picture-placeholder' style={{ height }} role='button' tabIndex={0} onClick={this.handleClick}>
         <Icon id='window-restore' />
         <FormattedMessage id='picture_in_picture.restore' defaultMessage='Put it back' />
       </div>
diff --git a/app/javascript/flavours/glitch/components/poll.jsx b/app/javascript/flavours/glitch/components/poll.jsx
index 2ccc1761e4..fb37612d9c 100644
--- a/app/javascript/flavours/glitch/components/poll.jsx
+++ b/app/javascript/flavours/glitch/components/poll.jsx
@@ -154,7 +154,7 @@ class Poll extends ImmutablePureComponent {
           {!showResults && (
             <span
               className={classNames('poll__input', { checkbox: poll.get('multiple'), active })}
-              tabIndex='0'
+              tabIndex={0}
               role={poll.get('multiple') ? 'checkbox' : 'radio'}
               onKeyPress={this.handleOptionKeyPress}
               aria-checked={active}
diff --git a/app/javascript/flavours/glitch/components/spoilers.jsx b/app/javascript/flavours/glitch/components/spoilers.jsx
index 75e4ec3a1a..d1d8758072 100644
--- a/app/javascript/flavours/glitch/components/spoilers.jsx
+++ b/app/javascript/flavours/glitch/components/spoilers.jsx
@@ -38,7 +38,7 @@ class Spoilers extends React.PureComponent {
       <p className='spoiler__text'>
         {spoilerText}
         {' '}
-        <button tabIndex='0' className='status__content__spoiler-link' onClick={this.handleSpoilerClick}>
+        <button tabIndex={0} className='status__content__spoiler-link' onClick={this.handleSpoilerClick}>
           {toggleText}
         </button>
       </p>,
diff --git a/app/javascript/flavours/glitch/components/status.jsx b/app/javascript/flavours/glitch/components/status.jsx
index fa90c98d02..fbb610823a 100644
--- a/app/javascript/flavours/glitch/components/status.jsx
+++ b/app/javascript/flavours/glitch/components/status.jsx
@@ -564,7 +564,7 @@ class Status extends ImmutablePureComponent {
     if (hidden) {
       return (
         <HotKeys handlers={handlers}>
-          <div ref={this.handleRef} className='status focusable' tabIndex='0'>
+          <div ref={this.handleRef} className='status focusable' tabIndex={0}>
             <span>{status.getIn(['account', 'display_name']) || status.getIn(['account', 'username'])}</span>
             <span>{status.get('content')}</span>
           </div>
@@ -581,7 +581,7 @@ class Status extends ImmutablePureComponent {
 
       return (
         <HotKeys handlers={minHandlers}>
-          <div className='status__wrapper status__wrapper--filtered focusable' tabIndex='0' ref={this.handleRef}>
+          <div className='status__wrapper status__wrapper--filtered focusable' tabIndex={0} ref={this.handleRef}>
             <FormattedMessage id='status.filtered' defaultMessage='Filtered' />: {matchedFilters.join(', ')}.
             {' '}
             <button className='status__wrapper--filtered__button' onClick={this.handleUnfilterClick}>
@@ -769,7 +769,7 @@ class Status extends ImmutablePureComponent {
           style={isCollapsed && background ? { backgroundImage: `url(${background})` } : null}
           {...selectorAttribs}
           ref={handleRef}
-          tabIndex='0'
+          tabIndex={0}
           data-featured={featured ? 'true' : null}
           aria-label={textForScreenReader(intl, status, rebloggedByText, !status.get('hidden'))}
         >
diff --git a/app/javascript/flavours/glitch/components/status_content.jsx b/app/javascript/flavours/glitch/components/status_content.jsx
index 34742c81b5..e66df588a3 100644
--- a/app/javascript/flavours/glitch/components/status_content.jsx
+++ b/app/javascript/flavours/glitch/components/status_content.jsx
@@ -387,7 +387,7 @@ class StatusContent extends React.PureComponent {
       }
 
       return (
-        <div className={classNames} tabIndex='0' onMouseDown={this.handleMouseDown} onMouseUp={this.handleMouseUp}>
+        <div className={classNames} tabIndex={0} onMouseDown={this.handleMouseDown} onMouseUp={this.handleMouseUp}>
           <p
             style={{ marginBottom: hidden && status.get('mentions').isEmpty() ? '0px' : null }}
           >
@@ -424,14 +424,14 @@ class StatusContent extends React.PureComponent {
           className={classNames}
           onMouseDown={this.handleMouseDown}
           onMouseUp={this.handleMouseUp}
-          tabIndex='0'
+          tabIndex={0}
         >
           <div
             ref={this.setContentsRef}
             key={`contents-${tagLinks}-${rewriteMentions}`}
             dangerouslySetInnerHTML={content}
             className='status__content__text translate'
-            tabIndex='0'
+            tabIndex={0}
             onMouseEnter={this.handleMouseEnter}
             onMouseLeave={this.handleMouseLeave}
             lang={lang}
@@ -445,14 +445,14 @@ class StatusContent extends React.PureComponent {
       return (
         <div
           className='status__content'
-          tabIndex='0'
+          tabIndex={0}
         >
           <div
             ref={this.setContentsRef}
             key={`contents-${tagLinks}`}
             className='status__content__text translate'
             dangerouslySetInnerHTML={content}
-            tabIndex='0'
+            tabIndex={0}
             onMouseEnter={this.handleMouseEnter}
             onMouseLeave={this.handleMouseLeave}
             lang={lang}
diff --git a/app/javascript/flavours/glitch/features/about/index.jsx b/app/javascript/flavours/glitch/features/about/index.jsx
index f366f734dd..67d5afbdd1 100644
--- a/app/javascript/flavours/glitch/features/about/index.jsx
+++ b/app/javascript/flavours/glitch/features/about/index.jsx
@@ -67,7 +67,7 @@ class Section extends React.PureComponent {
 
     return (
       <div className={classNames('about__section', { active: !collapsed })}>
-        <div className='about__section__title' role='button' tabIndex='0' onClick={this.handleClick}>
+        <div className='about__section__title' role='button' tabIndex={0} onClick={this.handleClick}>
           <Icon id={collapsed ? 'chevron-right' : 'chevron-down'} fixedWidth /> {title}
         </div>
 
diff --git a/app/javascript/flavours/glitch/features/account/components/account_note.jsx b/app/javascript/flavours/glitch/features/account/components/account_note.jsx
index 5adca87d0a..8ab00f6d48 100644
--- a/app/javascript/flavours/glitch/features/account/components/account_note.jsx
+++ b/app/javascript/flavours/glitch/features/account/components/account_note.jsx
@@ -53,11 +53,11 @@ class Header extends ImmutablePureComponent {
     if (isEditing) {
       action_buttons = (
         <div className='account__header__account-note__buttons'>
-          <button className='icon-button' tabIndex='0' onClick={this.props.onCancelAccountNote} disabled={isSubmitting}>
+          <button className='icon-button' tabIndex={0} onClick={this.props.onCancelAccountNote} disabled={isSubmitting}>
             <Icon id='times' size={15} /> <FormattedMessage id='account_note.cancel' defaultMessage='Cancel' />
           </button>
           <div className='flex-spacer' />
-          <button className='icon-button' tabIndex='0' onClick={this.props.onSaveAccountNote} disabled={isSubmitting}>
+          <button className='icon-button' tabIndex={0} onClick={this.props.onSaveAccountNote} disabled={isSubmitting}>
             <Icon id='check' size={15} /> <FormattedMessage id='account_note.save' defaultMessage='Save' />
           </button>
         </div>
@@ -65,7 +65,7 @@ class Header extends ImmutablePureComponent {
     } else {
       action_buttons = (
         <div className='account__header__account-note__buttons'>
-          <button className='icon-button' tabIndex='0' onClick={this.props.onEditAccountNote} disabled={isSubmitting}>
+          <button className='icon-button' tabIndex={0} onClick={this.props.onEditAccountNote} disabled={isSubmitting}>
             <Icon id='pencil' size={15} /> <FormattedMessage id='account_note.edit' defaultMessage='Edit' />
           </button>
         </div>
diff --git a/app/javascript/flavours/glitch/features/audio/index.jsx b/app/javascript/flavours/glitch/features/audio/index.jsx
index fd7229cc56..556a74ac48 100644
--- a/app/javascript/flavours/glitch/features/audio/index.jsx
+++ b/app/javascript/flavours/glitch/features/audio/index.jsx
@@ -476,7 +476,7 @@ class Audio extends React.PureComponent {
     }
 
     return (
-      <div className={classNames('audio-player', { editable, inactive: !revealed })} ref={this.setPlayerRef} style={{ backgroundColor: this._getBackgroundColor(), color: this._getForegroundColor(), width: '100%', height: this.props.fullscreen ? '100%' : (this.state.height || this.props.height) }} onMouseEnter={this.handleMouseEnter} onMouseLeave={this.handleMouseLeave} tabIndex='0' onKeyDown={this.handleKeyDown}>
+      <div className={classNames('audio-player', { editable, inactive: !revealed })} ref={this.setPlayerRef} style={{ backgroundColor: this._getBackgroundColor(), color: this._getForegroundColor(), width: '100%', height: this.props.fullscreen ? '100%' : (this.state.height || this.props.height) }} onMouseEnter={this.handleMouseEnter} onMouseLeave={this.handleMouseLeave} tabIndex={0} onKeyDown={this.handleKeyDown}>
 
         <Blurhash
           hash={blurhash}
@@ -499,7 +499,7 @@ class Audio extends React.PureComponent {
 
         <canvas
           role='button'
-          tabIndex='0'
+          tabIndex={0}
           className='audio-player__canvas'
           width={this.state.width}
           height={this.state.height}
@@ -532,7 +532,7 @@ class Audio extends React.PureComponent {
 
           <span
             className={classNames('video-player__seek__handle', { active: dragging })}
-            tabIndex='0'
+            tabIndex={0}
             style={{ left: `${progress}%`, backgroundColor: this._getAccentColor() }}
             onKeyDown={this.handleAudioKeyDown}
           />
@@ -549,7 +549,7 @@ class Audio extends React.PureComponent {
 
                 <span
                   className='video-player__volume__handle'
-                  tabIndex='0'
+                  tabIndex={0}
                   style={{ left: `${volume * 100}%`, backgroundColor: this._getAccentColor() }}
                 />
               </div>
diff --git a/app/javascript/flavours/glitch/features/compose/components/dropdown_menu.jsx b/app/javascript/flavours/glitch/features/compose/components/dropdown_menu.jsx
index 1ea0df536c..1ccccad31a 100644
--- a/app/javascript/flavours/glitch/features/compose/components/dropdown_menu.jsx
+++ b/app/javascript/flavours/glitch/features/compose/components/dropdown_menu.jsx
@@ -169,7 +169,7 @@ export default class ComposerOptionsDropdownContent extends React.PureComponent
         onClick={this.handleClick}
         onKeyDown={this.handleKeyDown}
         role='option'
-        tabIndex='0'
+        tabIndex={0}
         key={name}
         data-index={i}
         ref={active ? this.setFocusRef : null}
diff --git a/app/javascript/flavours/glitch/features/compose/components/language_dropdown.jsx b/app/javascript/flavours/glitch/features/compose/components/language_dropdown.jsx
index 14f285c3d2..05614de011 100644
--- a/app/javascript/flavours/glitch/features/compose/components/language_dropdown.jsx
+++ b/app/javascript/flavours/glitch/features/compose/components/language_dropdown.jsx
@@ -209,7 +209,7 @@ class LanguageDropdownMenu extends React.PureComponent {
     const { value } = this.props;
 
     return (
-      <div key={lang[0]} role='option' tabIndex='0' data-index={lang[0]} className={classNames('language-dropdown__dropdown__results__item', { active: lang[0] === value })} aria-selected={lang[0] === value} onClick={this.handleClick} onKeyDown={this.handleKeyDown}>
+      <div key={lang[0]} role='option' tabIndex={0} data-index={lang[0]} className={classNames('language-dropdown__dropdown__results__item', { active: lang[0] === value })} aria-selected={lang[0] === value} onClick={this.handleClick} onKeyDown={this.handleKeyDown}>
         <span className='language-dropdown__dropdown__results__item__native-name' lang={lang[0]}>{lang[2]}</span> <span className='language-dropdown__dropdown__results__item__common-name'>({lang[1]})</span>
       </div>
     );
diff --git a/app/javascript/flavours/glitch/features/compose/components/search.jsx b/app/javascript/flavours/glitch/features/compose/components/search.jsx
index d2187b8ae9..cb6afca8d3 100644
--- a/app/javascript/flavours/glitch/features/compose/components/search.jsx
+++ b/app/javascript/flavours/glitch/features/compose/components/search.jsx
@@ -147,7 +147,7 @@ class Search extends React.PureComponent {
           onBlur={this.handleBlur}
         />
 
-        <div role='button' tabIndex='0' className='search__icon' onClick={this.handleClear}>
+        <div role='button' tabIndex={0} className='search__icon' onClick={this.handleClear}>
           <Icon id='search' className={hasValue ? '' : 'active'} />
           <Icon id='times-circle' className={hasValue ? 'active' : ''} />
         </div>
diff --git a/app/javascript/flavours/glitch/features/compose/components/upload.jsx b/app/javascript/flavours/glitch/features/compose/components/upload.jsx
index 63582c6367..7d5784561c 100644
--- a/app/javascript/flavours/glitch/features/compose/components/upload.jsx
+++ b/app/javascript/flavours/glitch/features/compose/components/upload.jsx
@@ -43,7 +43,7 @@ export default class Upload extends ImmutablePureComponent {
     const y = ((focusY / -2) + .5) * 100;
 
     return (
-      <div className='compose-form__upload' tabIndex='0' role='button'>
+      <div className='compose-form__upload' tabIndex={0} role='button'>
         <Motion defaultStyle={{ scale: 0.8 }} style={{ scale: spring(1, { stiffness: 180, damping: 12 }) }}>
           {({ scale }) => (
             <div className='compose-form__upload-thumbnail' style={{ transform: `scale(${scale})`, backgroundImage: `url(${media.get('preview_url')})`, backgroundPosition: `${x}% ${y}%` }}>
diff --git a/app/javascript/flavours/glitch/features/direct_timeline/components/conversation.jsx b/app/javascript/flavours/glitch/features/direct_timeline/components/conversation.jsx
index 05fd68707f..63a331086b 100644
--- a/app/javascript/flavours/glitch/features/direct_timeline/components/conversation.jsx
+++ b/app/javascript/flavours/glitch/features/direct_timeline/components/conversation.jsx
@@ -182,7 +182,7 @@ class Conversation extends ImmutablePureComponent {
 
     return (
       <HotKeys handlers={handlers}>
-        <div className={classNames('conversation focusable muted', { 'conversation--unread': unread })} tabIndex='0'>
+        <div className={classNames('conversation focusable muted', { 'conversation--unread': unread })} tabIndex={0}>
           <div className='conversation__avatar' onClick={this.handleClick} role='presentation'>
             <AvatarComposite accounts={accounts} size={48} />
           </div>
diff --git a/app/javascript/flavours/glitch/features/filters/select_filter.jsx b/app/javascript/flavours/glitch/features/filters/select_filter.jsx
index b3285bc917..a33892f83f 100644
--- a/app/javascript/flavours/glitch/features/filters/select_filter.jsx
+++ b/app/javascript/flavours/glitch/features/filters/select_filter.jsx
@@ -65,7 +65,7 @@ class SelectFilter extends React.PureComponent {
     }
 
     return (
-      <div key={filter[0]} role='button' tabIndex='0' data-index={filter[0]} className='language-dropdown__dropdown__results__item' onClick={this.handleItemClick} onKeyDown={this.handleKeyDown}>
+      <div key={filter[0]} role='button' tabIndex={0} data-index={filter[0]} className='language-dropdown__dropdown__results__item' onClick={this.handleItemClick} onKeyDown={this.handleKeyDown}>
         <span className='language-dropdown__dropdown__results__item__native-name'>{filter[1]}</span> {warning}
       </div>
     );
@@ -73,7 +73,7 @@ class SelectFilter extends React.PureComponent {
 
   renderCreateNew (name) {
     return (
-      <div key='add-new-filter' role='button' tabIndex='0' className='language-dropdown__dropdown__results__item' onClick={this.handleNewFilterClick} onKeyDown={this.handleKeyDown}>
+      <div key='add-new-filter' role='button' tabIndex={0} className='language-dropdown__dropdown__results__item' onClick={this.handleNewFilterClick} onKeyDown={this.handleKeyDown}>
         <Icon id='plus' fixedWidth /> <FormattedMessage id='filter_modal.select_filter.prompt_new' defaultMessage='New category: {name}' values={{ name }} />
       </div>
     );
diff --git a/app/javascript/flavours/glitch/features/list_editor/components/search.jsx b/app/javascript/flavours/glitch/features/list_editor/components/search.jsx
index 94782ba69a..3b66bc325d 100644
--- a/app/javascript/flavours/glitch/features/list_editor/components/search.jsx
+++ b/app/javascript/flavours/glitch/features/list_editor/components/search.jsx
@@ -51,7 +51,7 @@ export default class Search extends React.PureComponent {
           />
         </label>
 
-        <div role='button' tabIndex='0' className='search__icon' onClick={this.handleClear}>
+        <div role='button' tabIndex={0} className='search__icon' onClick={this.handleClear}>
           <Icon id='search' className={classNames({ active: !hasValue })} />
           <Icon id='times-circle' aria-label={intl.formatMessage(messages.search)} className={classNames({ active: hasValue })} />
         </div>
diff --git a/app/javascript/flavours/glitch/features/list_editor/index.jsx b/app/javascript/flavours/glitch/features/list_editor/index.jsx
index 8b8a0cf310..44951d1c64 100644
--- a/app/javascript/flavours/glitch/features/list_editor/index.jsx
+++ b/app/javascript/flavours/glitch/features/list_editor/index.jsx
@@ -60,7 +60,7 @@ class ListEditor extends ImmutablePureComponent {
             {accountIds.map(accountId => <AccountContainer key={accountId} accountId={accountId} added />)}
           </div>
 
-          {showSearch && <div role='button' tabIndex='-1' className='drawer__backdrop' onClick={onClear} />}
+          {showSearch && <div role='button' tabIndex={-1} className='drawer__backdrop' onClick={onClear} />}
 
           <Motion defaultStyle={{ x: -100 }} style={{ x: spring(showSearch ? 0 : -100, { stiffness: 210, damping: 20 }) }}>
             {({ x }) =>
diff --git a/app/javascript/flavours/glitch/features/list_timeline/index.jsx b/app/javascript/flavours/glitch/features/list_timeline/index.jsx
index f885a751f3..a32383b130 100644
--- a/app/javascript/flavours/glitch/features/list_timeline/index.jsx
+++ b/app/javascript/flavours/glitch/features/list_timeline/index.jsx
@@ -177,11 +177,11 @@ class ListTimeline extends React.PureComponent {
           multiColumn={multiColumn}
         >
           <div className='column-settings__row column-header__links'>
-            <button className='text-btn column-header__setting-btn' tabIndex='0' onClick={this.handleEditClick}>
+            <button className='text-btn column-header__setting-btn' tabIndex={0} onClick={this.handleEditClick}>
               <Icon id='pencil' /> <FormattedMessage id='lists.edit' defaultMessage='Edit list' />
             </button>
 
-            <button className='text-btn column-header__setting-btn' tabIndex='0' onClick={this.handleDeleteClick}>
+            <button className='text-btn column-header__setting-btn' tabIndex={0} onClick={this.handleDeleteClick}>
               <Icon id='trash' /> <FormattedMessage id='lists.delete' defaultMessage='Delete list' />
             </button>
           </div>
diff --git a/app/javascript/flavours/glitch/features/local_settings/navigation/item/index.jsx b/app/javascript/flavours/glitch/features/local_settings/navigation/item/index.jsx
index a4d1b40fad..9ac6d9b73d 100644
--- a/app/javascript/flavours/glitch/features/local_settings/navigation/item/index.jsx
+++ b/app/javascript/flavours/glitch/features/local_settings/navigation/item/index.jsx
@@ -60,7 +60,7 @@ export default class LocalSettingsPage extends React.PureComponent {
       <a
         onClick={handleClick}
         role='button'
-        tabIndex='0'
+        tabIndex={0}
         className={finalClassName}
         title={title}
         aria-label={title}
diff --git a/app/javascript/flavours/glitch/features/notifications/components/admin_report.jsx b/app/javascript/flavours/glitch/features/notifications/components/admin_report.jsx
index 556df8f66b..9b55fe4e98 100644
--- a/app/javascript/flavours/glitch/features/notifications/components/admin_report.jsx
+++ b/app/javascript/flavours/glitch/features/notifications/components/admin_report.jsx
@@ -91,7 +91,7 @@ export default class AdminReport extends ImmutablePureComponent {
 
     return (
       <HotKeys handlers={this.getHandlers()}>
-        <div className={classNames('notification notification-admin-report focusable', { unread })} tabIndex='0'>
+        <div className={classNames('notification notification-admin-report focusable', { unread })} tabIndex={0}>
           <div className='notification__message'>
             <div className='notification__favourite-icon-wrapper'>
               <Icon id='flag' fixedWidth />
diff --git a/app/javascript/flavours/glitch/features/notifications/components/admin_signup.jsx b/app/javascript/flavours/glitch/features/notifications/components/admin_signup.jsx
index ead2a9701b..d982108e92 100644
--- a/app/javascript/flavours/glitch/features/notifications/components/admin_signup.jsx
+++ b/app/javascript/flavours/glitch/features/notifications/components/admin_signup.jsx
@@ -78,7 +78,7 @@ export default class NotificationFollow extends ImmutablePureComponent {
     //  Renders.
     return (
       <HotKeys handlers={this.getHandlers()}>
-        <div className={classNames('notification notification-admin-sign-up focusable', { unread })} tabIndex='0'>
+        <div className={classNames('notification notification-admin-sign-up focusable', { unread })} tabIndex={0}>
           <div className='notification__message'>
             <div className='notification__favourite-icon-wrapper'>
               <Icon fixedWidth id='user-plus' />
diff --git a/app/javascript/flavours/glitch/features/notifications/components/clear_column_button.jsx b/app/javascript/flavours/glitch/features/notifications/components/clear_column_button.jsx
index ee77cfb8e3..cd150314b7 100644
--- a/app/javascript/flavours/glitch/features/notifications/components/clear_column_button.jsx
+++ b/app/javascript/flavours/glitch/features/notifications/components/clear_column_button.jsx
@@ -11,7 +11,7 @@ export default class ClearColumnButton extends React.Component {
 
   render () {
     return (
-      <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>
+      <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/flavours/glitch/features/notifications/components/follow.jsx b/app/javascript/flavours/glitch/features/notifications/components/follow.jsx
index 434d6609da..e9ef70911e 100644
--- a/app/javascript/flavours/glitch/features/notifications/components/follow.jsx
+++ b/app/javascript/flavours/glitch/features/notifications/components/follow.jsx
@@ -78,7 +78,7 @@ export default class NotificationFollow extends ImmutablePureComponent {
     //  Renders.
     return (
       <HotKeys handlers={this.getHandlers()}>
-        <div className={classNames('notification notification-follow focusable', { unread })} tabIndex='0'>
+        <div className={classNames('notification notification-follow focusable', { unread })} tabIndex={0}>
           <div className='notification__message'>
             <div className='notification__favourite-icon-wrapper'>
               <Icon fixedWidth id='user-plus' />
diff --git a/app/javascript/flavours/glitch/features/notifications/components/follow_request.jsx b/app/javascript/flavours/glitch/features/notifications/components/follow_request.jsx
index 01dec320e2..2b985bc085 100644
--- a/app/javascript/flavours/glitch/features/notifications/components/follow_request.jsx
+++ b/app/javascript/flavours/glitch/features/notifications/components/follow_request.jsx
@@ -95,7 +95,7 @@ class FollowRequest extends ImmutablePureComponent {
 
     return (
       <HotKeys handlers={this.getHandlers()}>
-        <div className={classNames('notification notification-follow-request focusable', { unread })} tabIndex='0'>
+        <div className={classNames('notification notification-follow-request focusable', { unread })} tabIndex={0}>
           <div className='notification__message'>
             <div className='notification__favourite-icon-wrapper'>
               <Icon id='user' fixedWidth />
diff --git a/app/javascript/flavours/glitch/features/notifications/components/grant_permission_button.jsx b/app/javascript/flavours/glitch/features/notifications/components/grant_permission_button.jsx
index 798e4c7872..5b2db48fdb 100644
--- a/app/javascript/flavours/glitch/features/notifications/components/grant_permission_button.jsx
+++ b/app/javascript/flavours/glitch/features/notifications/components/grant_permission_button.jsx
@@ -10,7 +10,7 @@ export default class GrantPermissionButton extends React.PureComponent {
 
   render () {
     return (
-      <button className='text-btn column-header__permission-btn' tabIndex='0' onClick={this.props.onClick}>
+      <button className='text-btn column-header__permission-btn' tabIndex={0} onClick={this.props.onClick}>
         <FormattedMessage id='notifications.grant_permission' defaultMessage='Grant permission.' />
       </button>
     );
diff --git a/app/javascript/flavours/glitch/features/pinned_accounts_editor/index.jsx b/app/javascript/flavours/glitch/features/pinned_accounts_editor/index.jsx
index de3fff8ece..834de652f5 100644
--- a/app/javascript/flavours/glitch/features/pinned_accounts_editor/index.jsx
+++ b/app/javascript/flavours/glitch/features/pinned_accounts_editor/index.jsx
@@ -59,7 +59,7 @@ class PinnedAccountsEditor extends ImmutablePureComponent {
             {accountIds.map(accountId => <AccountContainer key={accountId} accountId={accountId} added />)}
           </div>
 
-          {showSearch && <div role='button' tabIndex='-1' className='drawer__backdrop' onClick={onClear} />}
+          {showSearch && <div role='button' tabIndex={-1} className='drawer__backdrop' onClick={onClear} />}
 
           <Motion defaultStyle={{ x: -100 }} style={{ x: spring(showSearch ? 0 : -100, { stiffness: 210, damping: 20 }) }}>
             {({ x }) =>
diff --git a/app/javascript/flavours/glitch/features/report/components/option.jsx b/app/javascript/flavours/glitch/features/report/components/option.jsx
index 6ecfc7a248..7827a6b3b3 100644
--- a/app/javascript/flavours/glitch/features/report/components/option.jsx
+++ b/app/javascript/flavours/glitch/features/report/components/option.jsx
@@ -40,7 +40,7 @@ export default class Option extends React.PureComponent {
 
         <span
           className={classNames('poll__input', { active: checked, checkbox: multiple })}
-          tabIndex='0'
+          tabIndex={0}
           role='radio'
           onKeyPress={this.handleKeyPress}
           aria-checked={checked}
diff --git a/app/javascript/flavours/glitch/features/status/index.jsx b/app/javascript/flavours/glitch/features/status/index.jsx
index a59da5e109..f01ad2dbe1 100644
--- a/app/javascript/flavours/glitch/features/status/index.jsx
+++ b/app/javascript/flavours/glitch/features/status/index.jsx
@@ -672,7 +672,7 @@ class Status extends ImmutablePureComponent {
             {ancestors}
 
             <HotKeys handlers={handlers}>
-              <div className='focusable' tabIndex='0' aria-label={textForScreenReader(intl, status, false, isExpanded)}>
+              <div className='focusable' tabIndex={0} aria-label={textForScreenReader(intl, status, false, isExpanded)}>
                 <DetailedStatus
                   key={`details-${status.get('id')}`}
                   status={status}
diff --git a/app/javascript/flavours/glitch/features/ui/components/actions_modal.jsx b/app/javascript/flavours/glitch/features/ui/components/actions_modal.jsx
index c6e3ee37c7..9a9b1a3f1f 100644
--- a/app/javascript/flavours/glitch/features/ui/components/actions_modal.jsx
+++ b/app/javascript/flavours/glitch/features/ui/components/actions_modal.jsx
@@ -36,7 +36,7 @@ export default class ActionsModal extends ImmutablePureComponent {
     if (!contents) {
       contents = (
         <React.Fragment>
-          {icon && <IconButton title={text} icon={icon} role='presentation' tabIndex='-1' inverted />}
+          {icon && <IconButton title={text} icon={icon} role='presentation' tabIndex={-1} inverted />}
           <div>
             <div className={classNames({ 'actions-modal__item-label': !!meta })}>{text}</div>
             <div>{meta}</div>
diff --git a/app/javascript/flavours/glitch/features/ui/components/column_link.jsx b/app/javascript/flavours/glitch/features/ui/components/column_link.jsx
index dcdac077fe..4fffa54f4c 100644
--- a/app/javascript/flavours/glitch/features/ui/components/column_link.jsx
+++ b/app/javascript/flavours/glitch/features/ui/components/column_link.jsx
@@ -32,7 +32,7 @@ const ColumnLink = ({ icon, text, to, onClick, href, method, badge, transparent,
       return onClick(e);
     };
     return (
-      <a href='#' onClick={onClick && handleOnClick} className={className} title={text} {...other} tabIndex='0'>
+      <a href='#' onClick={onClick && handleOnClick} className={className} title={text} {...other} tabIndex={0}>
         {iconElement}
         <span>{text}</span>
         {badgeElement}
diff --git a/app/javascript/flavours/glitch/features/ui/components/media_modal.jsx b/app/javascript/flavours/glitch/features/ui/components/media_modal.jsx
index a3811e91d3..fd2bd43cf5 100644
--- a/app/javascript/flavours/glitch/features/ui/components/media_modal.jsx
+++ b/app/javascript/flavours/glitch/features/ui/components/media_modal.jsx
@@ -140,8 +140,8 @@ class MediaModal extends ImmutablePureComponent {
 
     const index = this.getIndex();
 
-    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>;
+    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>;
 
     const content = media.map((image) => {
       const width  = image.getIn(['meta', 'original', 'width']) || null;
diff --git a/app/javascript/flavours/glitch/features/ui/components/onboarding_modal.jsx b/app/javascript/flavours/glitch/features/ui/components/onboarding_modal.jsx
index df84a15713..29eb91a6ba 100644
--- a/app/javascript/flavours/glitch/features/ui/components/onboarding_modal.jsx
+++ b/app/javascript/flavours/glitch/features/ui/components/onboarding_modal.jsx
@@ -299,7 +299,7 @@ class OnboardingModal extends React.PureComponent {
                 <div
                   key={`dot-${i}`}
                   role='button'
-                  tabIndex='0'
+                  tabIndex={0}
                   data-index={i}
                   onClick={this.handleDot}
                   className={className}
diff --git a/app/javascript/flavours/glitch/features/video/index.jsx b/app/javascript/flavours/glitch/features/video/index.jsx
index 80323770ca..28a8bb1fd7 100644
--- a/app/javascript/flavours/glitch/features/video/index.jsx
+++ b/app/javascript/flavours/glitch/features/video/index.jsx
@@ -600,7 +600,7 @@ class Video extends React.PureComponent {
           preload={preload}
           loop
           role='button'
-          tabIndex='0'
+          tabIndex={0}
           aria-label={alt}
           title={alt}
           lang={lang}
@@ -629,7 +629,7 @@ class Video extends React.PureComponent {
 
             <span
               className={classNames('video-player__seek__handle', { active: dragging })}
-              tabIndex='0'
+              tabIndex={0}
               style={{ left: `${progress}%` }}
               onKeyDown={this.handleVideoKeyDown}
             />
@@ -645,7 +645,7 @@ class Video extends React.PureComponent {
 
                 <span
                   className={classNames('video-player__volume__handle')}
-                  tabIndex='0'
+                  tabIndex={0}
                   style={{ left: `${volume * 100}%` }}
                 />
               </div>