You can set <b>browser.toolbars.bookmarks.2h2020 = false</b> on the <b>about:config</b> page to disable this new feature. You can open the <b>about:config</b> page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue. *https://support.mozilla.org/en-US/kb/about-config-editor-firefox ---- Note that in Firefox 85+ you will be able to right-click this "Other Bookmarks" icon on the Bookmarks Toolbar to toggle its appearance (Show Other Bookmarks).