Firefox is now not extending to full screen upon start-up

Firefox used to open msn homepage completely to the edges of our computer screen, excepting browser .. now.. inexplicably, it leaves a border of desktop background showing. We wish it to return to previous format. (?)
== This happened ==
Every time Firefox opened
== Between last night and this morning, while computer OFF.

Use Restore or Maximize in the right-click context menu of the Taskbar icon to set focus to the Firefox application if you do not see it.<br />
Open the system menu via Alt+Space and see if you can resize that window.
If that works then close Firefox (File > Exit/Quit) to save that setting.
See also:
* http://kb.mozillazine.org/Resizing_oversize_window
If the above didn't help then see:
* http://kb.mozillazine.org/Corrupt_localstore.rdf
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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Firefox is now not extending to full screen upon start-up

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