Lost configurations when rebooting pc

Whenever i restart my pc, the "browser.sessionstore.max_tabs_undo" entry in about:config turns to 0. I have to manually set it to 20 each time and if i don't open firefox as administrator it will set back to 0 if i restart firefox as well.
Also i have to re-set the "show my windows and tabs from last time" as well every time as well. If i manually restore last session after start up i wont have the same session i was browsing before turning the pc off.
Aside from that, the history and book marks are working good.
I am using firefox 27.0.1, windows 7 ultimate.

You can check for problems with the sessionstore.js and sessionstore.bak files in the Firefox profile folder that store session data.
Rename (or delete) the sessionstore.js file and possible sessionstore-##.js files with a number and sessionstore.bak in the Firefox profile folder.
*Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Multiple_profile_files_created
Deleting sessionstore.js will cause App Tabs and Tab Groups and open and closed (undo) tabs to get lost and you will have to recreate them (make a note or bookmark them if possible).
If you have software like Advanced SystemCare that might reset some files to older versions to protect these files against changes then check the settings or uninstall this software.

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