At about 9:00 am EST Firefox worked normally on my pc.
At about 11:30 am EST I opened Firefox and got a Mozilla screen that said the program had been changed.
Now all my bookmarks are gone.
Go to Solution.
Problems with bookmarks and history not working properly or losing bookmarks 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.
Did you try to reboot the computer or run Firefox once as Administrator in case some files weren't updated properly?
Recover lost or missing Bookmarks
Rebooted as administrator. Bookmarks came back in Firefox.
Problem solved. Thanks