diff --git a/app/javascript/mastodon/features/compose/components/action_bar.js b/app/javascript/mastodon/features/compose/components/action_bar.js
index d0303dbfbbf..dd2632796c0 100644
--- a/app/javascript/mastodon/features/compose/components/action_bar.js
+++ b/app/javascript/mastodon/features/compose/components/action_bar.js
@@ -23,9 +23,14 @@ class ActionBar extends React.PureComponent {
 
   static propTypes = {
     account: ImmutablePropTypes.map.isRequired,
+    onLogout: PropTypes.func.isRequired,
     intl: PropTypes.object.isRequired,
   };
 
+  handleLogout = () => {
+    this.props.onLogout();
+  }
+
   render () {
     const { intl } = this.props;
 
@@ -44,7 +49,7 @@ class ActionBar extends React.PureComponent {
     menu.push({ text: intl.formatMessage(messages.domain_blocks), to: '/domain_blocks' });
     menu.push({ text: intl.formatMessage(messages.filters), href: '/filters' });
     menu.push(null);
-    menu.push({ text: intl.formatMessage(messages.logout), href: '/auth/sign_out', target: null, method: 'delete' });
+    menu.push({ text: intl.formatMessage(messages.logout), action: this.handleLogout });
 
     return (
       <div className='compose__action-bar'>
diff --git a/app/javascript/mastodon/features/compose/components/navigation_bar.js b/app/javascript/mastodon/features/compose/components/navigation_bar.js
index d8d49cb95cd..840d0a3da3a 100644
--- a/app/javascript/mastodon/features/compose/components/navigation_bar.js
+++ b/app/javascript/mastodon/features/compose/components/navigation_bar.js
@@ -12,6 +12,7 @@ export default class NavigationBar extends ImmutablePureComponent {
 
   static propTypes = {
     account: ImmutablePropTypes.map.isRequired,
+    onLogout: PropTypes.func.isRequired,
     onClose: PropTypes.func,
   };
 
@@ -33,7 +34,7 @@ export default class NavigationBar extends ImmutablePureComponent {
 
         <div className='navigation-bar__actions'>
           <IconButton className='close' title='' icon='close' onClick={this.props.onClose} />
-          <ActionBar account={this.props.account} />
+          <ActionBar account={this.props.account} onLogout={this.props.onLogout} />
         </div>
       </div>
     );
diff --git a/app/javascript/mastodon/features/compose/containers/navigation_container.js b/app/javascript/mastodon/features/compose/containers/navigation_container.js
index eb9f3ea45e6..8606a642e49 100644
--- a/app/javascript/mastodon/features/compose/containers/navigation_container.js
+++ b/app/javascript/mastodon/features/compose/containers/navigation_container.js
@@ -1,11 +1,29 @@
 import { connect }   from 'react-redux';
+import { defineMessages, injectIntl } from 'react-intl';
 import NavigationBar from '../components/navigation_bar';
+import { logOut } from 'mastodon/utils/log_out';
+import { openModal } from 'mastodon/actions/modal';
 import { me } from '../../../initial_state';
 
+const messages = defineMessages({
+  logoutMessage: { id: 'confirmations.logout.message', defaultMessage: 'Are you sure you want to log out?' },
+  logoutConfirm: { id: 'confirmations.logout.confirm', defaultMessage: 'Log out' },
+});
+
 const mapStateToProps = state => {
   return {
     account: state.getIn(['accounts', me]),
   };
 };
 
-export default connect(mapStateToProps)(NavigationBar);
+const mapDispatchToProps = (dispatch, { intl }) => ({
+  onLogout () {
+    dispatch(openModal('CONFIRM', {
+      message: intl.formatMessage(messages.logoutMessage),
+      confirm: intl.formatMessage(messages.logoutConfirm),
+      onConfirm: () => logOut(),
+    }));
+  },
+});
+
+export default injectIntl(connect(mapStateToProps, mapDispatchToProps)(NavigationBar));
diff --git a/app/javascript/mastodon/features/compose/index.js b/app/javascript/mastodon/features/compose/index.js
index 0731abcf4d5..e2de8b0e6a2 100644
--- a/app/javascript/mastodon/features/compose/index.js
+++ b/app/javascript/mastodon/features/compose/index.js
@@ -12,9 +12,11 @@ import Motion from '../ui/util/optional_motion';
 import spring from 'react-motion/lib/spring';
 import SearchResultsContainer from './containers/search_results_container';
 import { changeComposing } from '../../actions/compose';
+import { openModal } from 'mastodon/actions/modal';
 import elephantUIPlane from '../../../images/elephant_ui_plane.svg';
 import { mascot } from '../../initial_state';
 import Icon from 'mastodon/components/icon';
+import { logOut } from 'mastodon/utils/log_out';
 
 const messages = defineMessages({
   start: { id: 'getting_started.heading', defaultMessage: 'Getting started' },
@@ -25,6 +27,8 @@ const messages = defineMessages({
   preferences: { id: 'navigation_bar.preferences', defaultMessage: 'Preferences' },
   logout: { id: 'navigation_bar.logout', defaultMessage: 'Logout' },
   compose: { id: 'navigation_bar.compose', defaultMessage: 'Compose new toot' },
+  logoutMessage: { id: 'confirmations.logout.message', defaultMessage: 'Are you sure you want to log out?' },
+  logoutConfirm: { id: 'confirmations.logout.confirm', defaultMessage: 'Log out' },
 });
 
 const mapStateToProps = (state, ownProps) => ({
@@ -61,6 +65,21 @@ class Compose extends React.PureComponent {
     }
   }
 
+  handleLogoutClick = e => {
+    const { dispatch, intl } = this.props;
+
+    e.preventDefault();
+    e.stopPropagation();
+
+    dispatch(openModal('CONFIRM', {
+      message: intl.formatMessage(messages.logoutMessage),
+      confirm: intl.formatMessage(messages.logoutConfirm),
+      onConfirm: () => logOut(),
+    }));
+
+    return false;
+  }
+
   onFocus = () => {
     this.props.dispatch(changeComposing(true));
   }
@@ -92,7 +111,7 @@ class Compose extends React.PureComponent {
             <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)}><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>
+          <a href='/auth/sign_out' className='drawer__tab' title={intl.formatMessage(messages.logout)} aria-label={intl.formatMessage(messages.logout)} onClick={this.handleLogoutClick}><Icon id='sign-out' fixedWidth /></a>
         </nav>
       );
     }
diff --git a/app/javascript/mastodon/features/ui/components/link_footer.js b/app/javascript/mastodon/features/ui/components/link_footer.js
index b481983dc88..2b9bd3875e2 100644
--- a/app/javascript/mastodon/features/ui/components/link_footer.js
+++ b/app/javascript/mastodon/features/ui/components/link_footer.js
@@ -1,35 +1,72 @@
+import { connect } from 'react-redux';
 import React from 'react';
 import PropTypes from 'prop-types';
-import { FormattedMessage } from 'react-intl';
+import { FormattedMessage, defineMessages, injectIntl } from 'react-intl';
 import { Link } from 'react-router-dom';
 import { invitesEnabled, version, repository, source_url } from 'mastodon/initial_state';
+import { logOut } from 'mastodon/utils/log_out';
+import { openModal } from 'mastodon/actions/modal';
 
-const LinkFooter = ({ withHotkeys }) => (
-  <div className='getting-started__footer'>
-    <ul>
-      {invitesEnabled && <li><a href='/invites' target='_blank'><FormattedMessage id='getting_started.invite' defaultMessage='Invite people' /></a> · </li>}
-      {withHotkeys && <li><Link to='/keyboard-shortcuts'><FormattedMessage id='navigation_bar.keyboard_shortcuts' defaultMessage='Hotkeys' /></Link> · </li>}
-      <li><a href='/auth/edit'><FormattedMessage id='getting_started.security' defaultMessage='Security' /></a> · </li>
-      <li><a href='/about/more' target='_blank'><FormattedMessage id='navigation_bar.info' defaultMessage='About this server' /></a> · </li>
-      <li><a href='https://joinmastodon.org/apps' target='_blank'><FormattedMessage id='navigation_bar.apps' defaultMessage='Mobile apps' /></a> · </li>
-      <li><a href='/terms' target='_blank'><FormattedMessage id='getting_started.terms' defaultMessage='Terms of service' /></a> · </li>
-      <li><a href='/settings/applications' target='_blank'><FormattedMessage id='getting_started.developers' defaultMessage='Developers' /></a> · </li>
-      <li><a href='https://docs.joinmastodon.org' target='_blank'><FormattedMessage id='getting_started.documentation' defaultMessage='Documentation' /></a> · </li>
-      <li><a href='/auth/sign_out' data-method='delete'><FormattedMessage id='navigation_bar.logout' defaultMessage='Logout' /></a></li>
-    </ul>
+const messages = defineMessages({
+  logoutMessage: { id: 'confirmations.logout.message', defaultMessage: 'Are you sure you want to log out?' },
+  logoutConfirm: { id: 'confirmations.logout.confirm', defaultMessage: 'Log out' },
+});
 
-    <p>
-      <FormattedMessage
-        id='getting_started.open_source_notice'
-        defaultMessage='Mastodon is open source software. You can contribute or report issues on GitHub at {github}.'
-        values={{ github: <span><a href={source_url} rel='noopener' target='_blank'>{repository}</a> (v{version})</span> }}
-      />
-    </p>
-  </div>
-);
+const mapDispatchToProps = (dispatch, { intl }) => ({
+  onLogout () {
+    dispatch(openModal('CONFIRM', {
+      message: intl.formatMessage(messages.logoutMessage),
+      confirm: intl.formatMessage(messages.logoutConfirm),
+      onConfirm: () => logOut(),
+    }));
+  },
+});
+
+export default @injectIntl
+@connect(null, mapDispatchToProps)
+class LinkFooter extends React.PureComponent {
+
+  static propTypes = {
+    withHotkeys: PropTypes.bool,
+    onLogout: PropTypes.func.isRequired,
+    intl: PropTypes.object.isRequired,
+  };
+
+  handleLogoutClick = e => {
+    e.preventDefault();
+    e.stopPropagation();
+
+    this.props.onLogout();
+
+    return false;
+  }
+
+  render () {
+    const { withHotkeys } = this.props;
+
+    return (
+      <div className='getting-started__footer'>
+        <ul>
+          {invitesEnabled && <li><a href='/invites' target='_blank'><FormattedMessage id='getting_started.invite' defaultMessage='Invite people' /></a> · </li>}
+          {withHotkeys && <li><Link to='/keyboard-shortcuts'><FormattedMessage id='navigation_bar.keyboard_shortcuts' defaultMessage='Hotkeys' /></Link> · </li>}
+          <li><a href='/auth/edit'><FormattedMessage id='getting_started.security' defaultMessage='Security' /></a> · </li>
+          <li><a href='/about/more' target='_blank'><FormattedMessage id='navigation_bar.info' defaultMessage='About this server' /></a> · </li>
+          <li><a href='https://joinmastodon.org/apps' target='_blank'><FormattedMessage id='navigation_bar.apps' defaultMessage='Mobile apps' /></a> · </li>
+          <li><a href='/terms' target='_blank'><FormattedMessage id='getting_started.terms' defaultMessage='Terms of service' /></a> · </li>
+          <li><a href='/settings/applications' target='_blank'><FormattedMessage id='getting_started.developers' defaultMessage='Developers' /></a> · </li>
+          <li><a href='https://docs.joinmastodon.org' target='_blank'><FormattedMessage id='getting_started.documentation' defaultMessage='Documentation' /></a> · </li>
+          <li><a href='/auth/sign_out' onClick={this.handleLogoutClick}><FormattedMessage id='navigation_bar.logout' defaultMessage='Logout' /></a></li>
+        </ul>
+
+        <p>
+          <FormattedMessage
+            id='getting_started.open_source_notice'
+            defaultMessage='Mastodon is open source software. You can contribute or report issues on GitHub at {github}.'
+            values={{ github: <span><a href={source_url} rel='noopener' target='_blank'>{repository}</a> (v{version})</span> }}
+          />
+        </p>
+      </div>
+    );
+  }
 
-LinkFooter.propTypes = {
-  withHotkeys: PropTypes.bool,
 };
-
-export default LinkFooter;
diff --git a/app/javascript/mastodon/utils/log_out.js b/app/javascript/mastodon/utils/log_out.js
new file mode 100644
index 00000000000..b43417f4b42
--- /dev/null
+++ b/app/javascript/mastodon/utils/log_out.js
@@ -0,0 +1,33 @@
+import Rails from 'rails-ujs';
+
+export const logOut = () => {
+  const form = document.createElement('form');
+
+  const methodInput = document.createElement('input');
+  methodInput.setAttribute('name', '_method');
+  methodInput.setAttribute('value', 'delete');
+  methodInput.setAttribute('type', 'hidden');
+  form.appendChild(methodInput);
+
+  const csrfToken = Rails.csrfToken();
+  const csrfParam = Rails.csrfParam();
+
+  if (csrfParam && csrfToken) {
+    const csrfInput = document.createElement('input');
+    csrfInput.setAttribute('name', csrfParam);
+    csrfInput.setAttribute('value', csrfToken);
+    csrfInput.setAttribute('type', 'hidden');
+    form.appendChild(csrfInput);
+  }
+
+  const submitButton = document.createElement('input');
+  submitButton.setAttribute('type', 'submit');
+  form.appendChild(submitButton);
+
+  form.method = 'post';
+  form.action = '/auth/sign_out';
+  form.style.display = 'none';
+
+  document.body.appendChild(form);
+  submitButton.click();
+};