How to delete all bookmarks at once?
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.
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!