Bookmarks
version 93.0 (64 bit) Windows 10, I have lost all my bookmarks and I can not bookmark any pages. The bookmark tabs are gone. I get the message: "The bookmarks and history system will not be functional because one of Firefox's files is in use by another application. Some security software can cause this problem" What security software?
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First, reboot the computer. Is the problem still there?
Yes, the problem is still present. Re-start; power off the computer over night; still there. This REALLY is concerning because I like Firefox but if I can't get it to work I'll have to change browsers.
If you have sync, and there is a problem anywhere, Shut Down Sync Immediately On All Devices to prevent the problem from spreading. Type https://accounts.firefox.com/settings<enter> in the address bar. Once the problem is fixed, perform the same repair on all computers/profiles before using sync again.
[v57+] Places Maintenance is built into Firefox.
Type about:support<enter> in the address bar.
You will find Places Database near the bottom. Press the Verify Integrity button.
If any errors are reported: https://support.mozilla.org/en-US/kb/fix-bookmarks-and-history-will-not-be-functional
The places.sqlite file contains your History and Bookmarks. And it looks like it is corrupted.
Type about:support<enter> in the address bar.
Under the page logo on the left side, you will see Application Basics. Under this find Profile Folder. To its right press the button Show Folder. This will open your file browser to the current Firefox profile. Now Close Firefox.
Locate the above file. Then rename or delete it. Restart Firefox. The browser should then create a new place.sqlite and recover your bookmarks from the backup files.
Note: Your history is not backed up and will be lost.