Komunitné fórum Firefox

Is there a way to delete a bookmark from the book-mark drop-down window (accessed from triple horizontal bar/right side of browser) but retain the same book-mark that had been saved in a folder created in Other Bookmarks? I discovered that when you delete a book-mark entry from drop down menu, the same entry is also deleted from its saved location in Other Book Marks. I was trying to reduce number of unsorted entries in drop down menu while saving (and retaining) the same link in the Other Bookmarks section and folder. I want to continue using the sorting and discrete folder saving possible with the Other Bookmark section but clean up the clutter in the unsorted bookmark section.

Greetings from North-East of France, since a few weeks ago I'm seeing a (sort of) pop-up window suggesting to login with a Google account (see the screenshot attached). I've done some internet search to find out how to get rid of it, but the only suggestion I get is to modify an option in a Google account. However, I do not have a Google account! How to get rid of this disturbing pop-up? I already use Adblock Plus and uBlock Origin, yet Google passes through them! Thank you in advance for any help you may provide.