Select a bookmark, or a group. Press Delete.

You can check for problems with the places.sqlite database file in the Firefox profile folder.

• http://kb.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox
• https://support.mozilla.org/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file

• Places Maintenance: https://addons.mozilla.org/firefox/addon/places-maintenance/

Karen_Baker said

Some bookmarks cannot be removed because the edit bookmark feature does not display when those particular bookmarks are selected. Yet I have been able to remove many others. The same ones repeatedly cannot be removed. Why?

FredMcD said

Select a bookmark, or a group. Press Delete.

To FredMcD: I finally figured out to "Right" click both the bookmark and delete. Thanks for your suggestion. ... Karen

Glad to help. Safe Surfing.