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Lost Tabs and No Recently Closed Tabs

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Hi, I recently tried to update my video driver, and afterward I was unable to login to Forge of Empires. They said I needed to restart Firefox, which I did. Unfortunately, I accidentally clicked on it twice, opening two instances, and then closed one without allowing either one to finish loading first. The one I didn't close only had one tab, so I went to Recently Closed Tabs to see about restoring my previous session, but it was empty. I also found all of the tabs in my Simple Tab Groups extension were gone so I couldn't restore it from there. My bookmarks still remain. I followed instructions I found to use the .jsonlz4 files, but they also only had the one tab. As suggested in another support page, I also searched for index.dat files, but found none relating to Firefox. Should I have any hope of recovery, or do I need to start over from scratch? Please help. Thanks, Geoffrey

Hi, I recently tried to update my video driver, and afterward I was unable to login to Forge of Empires. They said I needed to restart Firefox, which I did. Unfortunately, I accidentally clicked on it twice, opening two instances, and then closed one without allowing either one to finish loading first. The one I didn't close only had one tab, so I went to Recently Closed Tabs to see about restoring my previous session, but it was empty. I also found all of the tabs in my Simple Tab Groups extension were gone so I couldn't restore it from there. My bookmarks still remain. I followed instructions I found to use the .jsonlz4 files, but they also only had the one tab. As suggested in another support page, I also searched for index.dat files, but found none relating to Firefox. Should I have any hope of recovery, or do I need to start over from scratch? Please help. Thanks, Geoffrey

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Did you also look for History -> Recently Closed Windows and Restore Previous Session?

Maybe you have a recent upgrade file with that lost window.

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

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 with Firefox closed.

  • make sure to backup the current sessionstore.jsonlz4

You can look at this tool to inspect a compressed jsonlz4 sessionstore file. This tool works locally, no uploading done.

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