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Closed most of my opened tabs. Can't recover all, only some. That's bad.

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Firefox closed most of my tabs. I had like 1800, now it's 150. I know it's much, but there were some important things to save. Can't recover all, only 150. When opening, I'm always doing History -> Restore previous session. Before it happened, it opened, like, in error, there were script error message popup. Don't know how much tabs were opened then. Then I closed ff, because it wasn't working properly, like, mid mouse button didn't work, it didn't react to keyboard. Then I reopened and had only 150 tabs. This is really bad, pissed me off. Feels like it's telling me how am I supposed to use browser. I don't like recent changes to ff. It's counter to my bad workflow.

Cheers

Firefox closed most of my tabs. I had like 1800, now it's 150. I know it's much, but there were some important things to save. Can't recover all, only 150. When opening, I'm always doing History -> Restore previous session. Before it happened, it opened, like, in error, there were script error message popup. Don't know how much tabs were opened then. Then I closed ff, because it wasn't working properly, like, mid mouse button didn't work, it didn't react to keyboard. Then I reopened and had only 150 tabs. This is really bad, pissed me off. Feels like it's telling me how am I supposed to use browser. I don't like recent changes to ff. It's counter to my bad workflow. Cheers

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Best in case of issues with reloading tabs is not to close Firefox, but go to the profile folder and backup the files in the sessionstore-backups folder with Firefox still running to prevent losing sessionstore files.

You can check in Windows Explorer with Firefox closed if there is a previous version of the sessionstore.jsonlz4 in the main profile folder (this file is only present when Firefox isn't running) and of files in the sessionstore-backups folder available.

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.