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restoring crashed session

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I am trying to restore the tabs from a crashed session. I have successfully done this in the past by renaming the lost session in the sessionstore-backups folder, but this is no longer working for me. I have the session file I need, but even when I rename it, when I reopen firefox it keeps reverting to the most recent session which has none of my tabs. I have tried deleting every file in the sessionstore folder except the one I want firefox to use, but it will not use it; it overwrites it every time with the more recent session. How can I get firefox to load the session file I want? Thanks for your help

I am trying to restore the tabs from a crashed session. I have successfully done this in the past by renaming the lost session in the sessionstore-backups folder, but this is no longer working for me. I have the session file I need, but even when I rename it, when I reopen firefox it keeps reverting to the most recent session which has none of my tabs. I have tried deleting every file in the sessionstore folder except the one I want firefox to use, but it will not use it; it overwrites it every time with the more recent session. How can I get firefox to load the session file I want? Thanks for your help

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You need to copy a compressed sessionstore file as sessionstore.jsonlz4 to the main profile folder level to make Firefox use this file.

You can look at this tool to inspect a compressed sessionstore file to see if the file is possibly corrupted.

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When Firefox exits normally, it should create sessionstore.jsonlz4 at the main level of the profile folder (not in the sessionstore-backups subfolder). You probably need to hide that file, too, or at the next startup, Firefox will use it preferentially before any files in the sessionstore-backups subfolder.