WhenI try to restore bookmarks, which have disappeared, Firefox says that it cannot read any of the ten backup bookmark filess
All the bookmarks on Firefox have disappeared and no new ones can be added. I tried the backup procedure to restore lost bookmarks but I am told that the backup files (all ten of them, by date) cannot be read. History files also are not shown.
Opaite Mbohovái (1)
You can check for problems with the places.sqlite database file in the Firefox profile folder and delete all places.sqlite files.