Some time ago I had imported a group of bookmarks into the
new Firefox browser.

I have some duplications as the imported bookmarks were from
a data recovery from a crashed hard drive.

Now I find I can't move or delete these imported bookmarks?

Any suggestions?

I've tried keyboard shortcuts as well as the toolbar tools.

I'd really like to clean up and organize these bookmarks.

Any suggestions or help appreciated!

Bookmark duplicate detector?: Firefox add on.

Bookmarks? Organize bookmarks?