This has worked for me in the past. 1: Close firefox. 2: Hit the Windows + R key to open runbox 3: Type %APpDATA%\Mozilla\Firefox\Profiles\ in the run box and click ok 4: Make a backup copy of your default user folder you are using. 5: Open your user folder and find "places.sqlite" 6: Change "places.sqlite" file extension by adding .old to the end 7: Open Firefox 8: Close Firefox 9: Go back to Firefox default user folder from step 3 & 4 10: Delete the new "places.sqlite" Firefox created 11: Remove .old extension from the "places.sqlite.old" file you renamed so it is back to being "places.sqlite". 12: Open Firefox back up while doing a prayer and ritual sacrifice hoping your problem is fixed 😹 Firefox profiles location: %APpDATA%\Mozilla\Firefox\Profiles\