Tried restoring the bookmarks using "Back up and Restore" here: https://support.mozilla.org/en-US/kb/restore-bookmarks-from-backup-or-move-them
But it does not work Firefox is "unable to process the file". Tried +10 history dates with the same negative response.
I'll need a way to manually restore/import the bookmarks from the right folder somehow.
Pls advice, tx!
Problems with bookmarks and history not working properly can be caused by a corrupted places.sqlite database file.
You can check for problems with the places.sqlite database file in the Firefox Profile Folder.