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Firefox keeps losing session/tabs

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Since recently Firefox keeps losing my session/tabs. This happened thrice in the last days. Yesterday, I even refreshed Firefox (about:support > Refresh Firefox...) but today all my tabs were gone. In addition, upon closing Firefox asks if I really wan't to close it and the open tabs although "Restore previous session" is enabled.

about:crashes shows no crash reports.

OS: Ubuntu 21.04 64-bit Firefox: 91.0.2/20210823123856 Add-ons: Sidebery, uBlock Origin, Privacy Badger On a different computer with Windows 10 (and same add-ons) the problem doesn't appear.

Since recently Firefox keeps losing my session/tabs. This happened thrice in the last days. Yesterday, I even refreshed Firefox (''about:support > Refresh Firefox...'') but today all my tabs were gone. In addition, upon closing Firefox asks if I really wan't to close it and the open tabs although "Restore previous session" is enabled. ''about:crashes'' shows no crash reports. OS: Ubuntu 21.04 64-bit Firefox: 91.0.2/20210823123856 Add-ons: Sidebery, uBlock Origin, Privacy Badger On a different computer with Windows 10 (and same add-ons) the problem doesn't appear.

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You may have corrupt sessionstore [v56] sessionstore.jsonlz4 file(s). Delete all sessionstore* files and the sessionstore-backups folder.

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.

Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder

Linux: Under the page logo on the left side, you will see Application Basics. Under this find Profile Directory. To its right press the button Open Directory.

Locate the above file. Then rename or delete it. Restart Firefox.


Don't delete the files if you need to rescue any data from them, just move them out of the profile folder to some location where Firefox doesn't look for them. You can try to read out their contents using this tool: https://www.jeffersonscher.com/res/scrounger.html

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Thank you! I will try it next time when it happens.