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Why can't I find session store files?

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Delagator
Delagator
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I lost all my tabs. Restore previous session is greyed out. I can't find any session store files. This happened after an automatic Windows update overnight (9/14) and a firefox update when I clicked on Firefox this morning.

I lost all my tabs. Restore previous session is greyed out. I can't find any session store files. This happened after an automatic Windows update overnight (9/14) and a firefox update when I clicked on Firefox this morning.

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cor-el
cor-el
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You can check the sessionstore-backups folder in the profile folder for a recent upgrade.jsonlz4s file. You can use this tool to check if the file contains that lost sesion.

Firefox uses the sessionstore.jsonlz4 file in the profile folder to store session data. The sessionstore.jsonlz4 file is only present when Firefox is closed. The sessionstore.jsonlz4 file is created from recovery.jsonlz4 when you close Firefox and is removed and copied to previous.jsonlz4 when you start Firefox to make is possible to restore the session at any time.

Backup the session files in the sessionstore-backups folder in the Firefox Profile Folder to make sure not to lose possible important session data. Do NOT close Firefox when Firefox is already running.

You will normally find these files in the sessionstore-backups folder:

  • previous.jsonlz4 (cleanBackup: copy of sessionstore.jsonlz4 from previous session that was loaded successfully)
  • recovery.jsonlz4 (latest version of sessionstore.jsonlz4 written during runtime)
  • recovery.baklz4 (previous version of sessionstore.jsonlz4 written during runtime)
  • upgrade.jsonlz4-<build_id> (backup created during an upgrade of Firefox)

You can copy a file from the sessionstore-backups folder to the main profile and rename the file to sessionstore.jsonlz4 to replace the current file (make sure to backup the current sessionstore.jsonlz4).

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

Delagator
Delagator Porandu apoha
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I used the scrounger tool but only found tabs visited today. I assume that's because I shut down and restarted Firefox yesterday when I was trying different things to restore tabs? Does that mean they're gone forever?

Thanks for the link to scrounger tool. I'll use that if this happens again.

cor-el
cor-el
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Did you look at the upgrade.jsonlz4 files that Firefox creates when it updates?