Bookmarks have reverted to a very old (untidy) version - why might this happen?
My tidy set of bookmarks vanished between Firefox sessions to be replaced by a set that is about 6 months old and without the hours of tidying I had recently undertaken.
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Are you using any bookmark add-ons?
https://support.mozilla.org/en-US/kb/how-to-fix-preferences-wont-save
Note: Some software, like Advanced SystemCare with Surfing Protection, can protect files in the Firefox profile folder against changes. If you have such software then check the settings or uninstall this software.
Places Maintenance {web link} Allows to run Maintenance tasks on the database that drives Places, the bookmarks and history module behind Firefox.
Open the Add-ons Manager. Locate the add-on and press the Options button. Then follow the directions.
Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options) key, and then starting Firefox.
A small dialog should appear. Click Start In Safe Mode (not Refresh).
Is the problem still there?
Thanks for response - no add ons and same issue in safe mode. Weird that it happened between Firefox sessions on same W10-boot session. Didn't do any maintenance or use any other browser between sessions. Places maintenance didn't find any issues or reduce db size. Looks like I'll have to redo the housekeeping! :(
Here's hoping.
These add-ons can be a great help by backing up and restoring Firefox
FEBE (Firefox Environment Backup Extension) {web link} FEBE allows you to quickly and easily backup your Firefox extensions, history, passwords, and more. In fact, it goes beyond just backing up -- It will actually rebuild your saved files individually into installable .xpi files. It will also make backups of files that you choose.
OPIE {web link} Import/Export extension preferences