Why does Mozilla Firefox open to a previous session?

Whenever I launch Mozilla Firefox, a session from a little more than a week ago opens up. Usually it opens up to my homepage. Now, it opens up with 8 tabs. They are: my Yahoo mail, my Gmail, 4 other Google sites, and an Amazon site.
How can I put a stop to this?
Thank you to any and everyone with a suggestion.

It is possible that there is a problem with the files sessionstore.js and sessionstore.bak in the Firefox Profile Folder.
Delete the sessionstore.js [2] file and possible sessionstore-##.js [3] files with a number and sessionstore.bak in the Firefox Profile Folder.
* Help > Troubleshooting Information > Profile Directory: Open Containing Folder
* http://kb.mozillazine.org/Profile_folder_-_Firefox
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
* [3] http://kb.mozillazine.org/Multiple_profile_files_created

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