Recent answers to Sidebar Bookmarkshttps://support.mozilla.org/en-US/questions/13100112020-10-24T06:14:34-07:00Firefox doesn't have an auto-close feature for the sidebar.
You can possibly add the "Bookmarks Menu2020-10-24T06:14:34-07:00cor-elhttps://support.mozilla.org/en-US/questions/1310011#answer-1360966<p>Firefox doesn't have an auto-close feature for the sidebar.
</p><p>You can possibly add the "Bookmarks Menu" button that shows the bookmarks in a drop-down list to the Navigation Toolbar via these steps:
</p>
<ul><li>click the bookshelf <img class="wiki-image frameless" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/gallery/images/2017-10-11-11-30-17-d521f7.png" alt="57 library icon" title=""> icon on the Navigation Toolbar or alternatively use the Library menu in the "3-bar" Firefox menu button <img class="wiki-image frameless" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/gallery/images/2014-01-10-13-08-08-f52b8c.png" alt="New Fx Menu" title=""> drop-down list
</li><li>click Bookmarks
</li><li>click "Bookmarking Tools", then click "Add Bookmarks Menu to Toolbar"
</li></ul>
<div>The Bookmark Menu button <img class="wiki-image frameless" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/gallery/images/2017-10-14-13-54-51-ad9ea7.png" alt="Bookmark Menu icon (star on tray)" title=""> should appear on the Navigation Toolbar.
</div>
<p>You can also drag the Bookmarks Menu button from the Customize palette to the Navigation Toolbar
</p><p>See also "<i>How do I add the Bookmarks Menu button to the toolbar?</i>":
</p>
<ul><li><a href="https://support.mozilla.org/en-US/kb/bookmarks-firefox#firefox:win10:fx57" rel="nofollow">https://support.mozilla.org/en-US/kb/bookmarks-firefox#firefox:win10:fx57</a>
</li></ul>
<p>There is a pref to control auto-close to make it possible to open more than one bookmark and other prefs to open the bookmark in a new tab and open the bookmark in the background (focus).
</p>
<ul><li> browser.bookmarks.openInTabClosesMenu
</li><li> browser.tabs.loadBookmarksInTabs
</li><li> browser.tabs.loadBookmarksInBackground
</li><li><a href="https://support.mozilla.org/en-US/kb/about-config-editor-firefox" rel="nofollow">https://support.mozilla.org/en-US/kb/about-config-editor-firefox</a>
</li></ul>