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When Firefox starts it opens 22 new windows.

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All of a sudden when I first start Firefox it opens literally 22 new blank windows. It used to be that one of them was my last browsing session but now they're all blank without even a home page or my pinned app tabs. I have no idea why that started, I don't think I changed anything.

All of a sudden when I first start Firefox it opens literally 22 new blank windows. It used to be that one of them was my last browsing session but now they're all blank without even a home page or my pinned app tabs. I have no idea why that started, I don't think I changed anything.

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It is possible that there is a problem with the files sessionstore.js and sessionstore.bak in the Firefox Profile Folder.

Delete the files sessionstore.js [2] and sessionstore.bak in the Firefox Profile Folder.

If you see files sessionstore-##.js with a number in the left part of the name like sessionstore-1.js then delete those as well.
Deleting sessionstore.js will cause App Tabs and Tab Groups and open and closed (undo) tabs to get lost, so you will have to create them again (make a note or bookmark them).

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