WHY does Firefox repeatedly open multiple copies of tabs that are already open??? Yesterday I cleared the history, removed the program & reinstalled. Didn't help. Some tabs are ones I had months ago but don't need now. They keep appearing. HELP, please!

The problem started several months ago, after I downloaded a new version of the program. Two updates ago, I think. The repeat tabs open multiple times during the day. Sometimes they appear hours after I've closed them--sometimes just minutes later.

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.
* Help > Troubleshooting Information > Profile Directory: Open Containing Folder
* http://kb.mozillazine.org/Profile_folder_-_Firefox
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.<br />
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).
See also:
* [1] http://kb.mozillazine.org/Session_Restore
* [2] http://kb.mozillazine.org/sessionstore.js

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