Mozilla changed the format of session backup files and that means that the previous way of restoring sessions needed updating. Use these if previous.jsonlz4 fails to do the trick. upgrade.jsonlz4-"number" - previous session backups, usually created during upgrades of the browser.previous.jsonlz4 - the last session backup that Firefox created.This is the file that you want to try to restore first (unless it has a very low size).In case you find any trouble you should contact Mozilla Firefox customer service number to get the easy help. These solutions are quite easy to follow, and one can easily fix the issue and resume the services of Mozilla Firefox. Navigate “places.sqlite” and change its name to “” and “places.sqlite-journal” to “.”.Now in the “application basics” open “open folder> profile folder.Then go to “troubleshooting information.”.Now you need to create new places database with these steps If you face that the problem is periodic and happen randomly, then the reason may be the corrupted places database. Then restart Mozilla Firefox to save the changes.Navigate sessionstore.js file and delete them.Under the “application basics folder select the “open folder” option.After clicking the “≡” icon, you need to go to the “help” and then “troubleshooting information.”.Now you need to remove these files to fix the issue: While the duplicate processing files have been created and restored that lower down the speed of Mozilla Firefox. To delete duplicated session restore files If the problem still exists, then you should remove the extension itself.In the pop-up menu, you need to click on “restart” and press the “start in safe mode” button.Press the “restart with add-ons disabled button.”.Select “help,” and then click “troubleshooting information.”.Click on the “≡” icon and get the drop-down menu.
So you need to fix the issue with these steps: Some add-on/extensions may be the reason behind the issue. Unmark the box “use hardware acceleration when available.”.
Unmark the box “use recommended performance settings.”.Select “general” option then click to “performance.”.