When opening Firefox, it opens 4 separate FF programs with a blank page on each program.

I have my Firefox home page set up as Yahoo! Mail, but when I first open Firefox I receive 4 separate Firefox sessions with a blank page for each session. When I click on Tools/Options, it says Yahoo! Mail is still my home page.

It is possible that there is problem with the files [http://kb.mozillazine.org/sessionstore.js sessionstore.js] and sessionstore.bak in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Profile Folder]
Delete [http://kb.mozillazine.org/sessionstore.js sessionstore.js] and sessionstore.bak in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Profile Folder]
* Help > Troubleshooting Information > Profile Directory: Open Containing 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.
You will have to redo App Tabs and Tab Groups after deleting sessionstore.js.
See:
* http://kb.mozillazine.org/Session_Restore

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