Please explain the problem in detail.
What happens? What is/are the exact error message(s) ?
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.
Please explain the problem in detail.
What happens? What is/are the exact error message(s) ?
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.