Groups of bookmarks are gone
Mac 10.15.7. FIREFOX 86. Groups of bookmarks are gone. This happens regularly. Bookmarks I rebuild yesterday, that group is gone today.
The bookmarks are "there" but not in their group. Takes hours to re-sort.
It takes a LONG time to rebuild from HTML backup. The jsn backup is ok, but it wipes everything I have done today out. I backup almost every day.
I have thousands of bookmarks = hours of work. Then I have to spend many hours rebuilding. 1/ What is happening? 2/ How to stop it?