Enter about:config in the URL bar and set browser.library.activity-stream.enabled = false.

The menu is still populated, and I bookmarked another page and it showed up in Recently Bookmarked.

I restarted Firefox and checked Advanced Preferences. It shows that setting as "false" but still allows the Recently Bookmarked to populate and add new bookmarks.

Ah, you want to remove the second list. I don't think it's removable. You can only remove the whole Library and add Bookmarks and History instead, by using the ≡ -> Customize menu.

Well, that explains why I can't remove either Recently Bookmarked or the Library itself. I still think it is a weird oversight that it is so hardcoded in a browser that represents itself as a leading privacy guardian. Thanks, Ty.

You cane Right click and delete the icon that shows recently bookmarked, then go to custom settings and add the "star above horizontal parenthesis" icon > show your bookmarks, then drag wherever you want it.

I accidentally deleted "recently bookmarked" from the bookmarks menu, and wish to restore it. How do I go about this?

I just noticed that I have this problem too. Firefox is tracking my most recently bookmarked. I followed the steps for about:config and changed it from true to false so it won't continue tracking but how do I clear the whole list? I found the list by clicking the icon in the upper right with the 3 lines and the slanted line (see screenshot). Then I clicked Bookmarks and it shows Recently Bookmarked. Thanks. Barbara

You can possibly use code in userChrome.css to hide these recent lists,

• /questions/1222037 turn off recently bookmarked

Add code to the userChrome.css file below the default @namespace line.

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* only needed once */

/* hide Recently Bookmarked */
 #panelMenu_recentBookmarks,
 #panelMenu_bookmarksMenu {display:none!important;}
 #appMenu-library-recentHighlights [type="highlight-bookmark"] {display:none!important;}

/* hide Recent History */
 #PanelUI-history label[value="Recent History"],
 #appMenu_historyMenu {display:none!important;}

/* hide Recent Highlights */
 #appMenu-libraryView label[value="Recent Highlights"],
 #appMenu-library-recentHighlights {display:none!important;}

/* hide Recently Closed Tabs/Windows */
 #appMenuRecentlyClosedTabs,
 #appMenuRecentlyClosedWindows {display:none!important;}