Do you really want to do this?? If you explain why, you might get better answers.

You could try:

Bookmarks > Show All Bookmarks

In the left pane, click Bookmarks Menu

Click in the right pane, press Ctrl+a to select all, then right-click and... I can't bear the thought.

You can also do that via the Save-mode start window.

• https://support.mozilla.com/kb/Safe+Mode

Had the same problem and found all kinds of answers that either didn't work or were above my skill level (I'm new to Linux / Ubuntu) until the suggestion by jscher2000.

Thank you so much!