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Can not get previous session tabs back?? That history button is ghosted.

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After a crash, there is no choice for restoring the previous session with all the previous tabs.

After a crash, there is no choice for restoring the previous session with all the previous tabs.

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Do you have a sessionstore.bak file in the Firefox profile folder or numbered sessionstore-##.js files?

You can use this button to go to the currently used Firefox profile folder:

You can make a backup copy of the sessionstore.bak file and other present sessionstore files elsewhere.

Note that Windows hides some file extensions by default.
Among them are .html and .ini and .js and .txt, so you may only see file name without file extension.
You can see the real file type (file extension) in the properties of the file via the right-click context menu in Windows Explorer.