Running Firefox 89.0, Win10. I usually bookmark all tabs in a window to a named folder under Bookmarks Menu, for example Folder1, Folder2, Folder3, etc. Recently, the dialog was stuck to a previous folder, lets say Folder2, as the default, instead of the normal default of "Bookmarks Menu". If I bookmark Folder4, it will want to put it under Folder2 as a subfolder, unless I manually change it to Bookmarks Menu, but the next time the default will go back to Folder2. After trying to manually set the default back to Bookmarks Menu, without success, I tried renaming Folder2, thinking the default will go back to Bookmarks Menu. This didn't work, Firefox chose the new Folder2 name automatically. So next I opened all the tabs in Folder2, deleted the Folder2 in the bookmarks manager, thinking that if Firefox couldn't find Folder2, it would fallback to the old default of Bookmarks Menu. Now when I try to bookmark anything, the save dialog is blank and the only thing I can click is the cancel button. How do I fix this? I have hundreds of tabs open, since the session manager I used to use is no longer supported, I was in the process of saving windows into bookmark folders. I'm worried that restarting Firefox will lose some of recent changes to my open windows/tabs state since the last time Firefox "autosaved?" my session

Thanks