Firefox error
 

Hello.
How do I delete a bookmark in Firefox 49.0?.
I have a bookmark in your favorite and can not be removed.
That means no "edit tab". At the other tabs of the "edit tab" appears.
Ubuntu 16.04 64-bit

right-click the bookmark => delete ?

This way does not work.

Bookmarks-->Show All Bookmarks-->Highlight the target-->Organize-->Delete.

(I just tested it.)

Thank you very much. They managed to erase.