Firefox 84+ adds this ''Other Bookmarks'' button when there are bookmarks in the "Other Bookmarks" folder as part of new bookmark features that are current under development. You might be participating in a shield study if you see this happening in Firefox 84, you can check this via the about:studies page. *https://support.mozilla.org/en-US/kb/shield ---- You can set <b>browser.toolbars.bookmarks.2h2020 = false</b> on the <b>about:config</b> page. *[/questions/1320638] Other Bookmarks popped up in Toolbar Note that in Firefox 85+ (scheduled for release next week) you can right-click this "Other Bookmarks" icon on the Bookmarks Toolbar to toggle its appearance (Show Other Bookmarks).