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How do you delete a tab that is on the line above the .com address line

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I have several tabs on the top bar above the .com address line How do you delete these tabs. I can close them, but they reopen when you close/open Firefox again.

I have several tabs on the top bar above the .com address line How do you delete these tabs. I can close them, but they reopen when you close/open Firefox again.

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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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