Why does ctrl+shift+t many times open a random tab instead of the latest closed tab?

That's it, sometimes (I can't precise what causes it) when I dpressctrl+shift+t, firefox instead of undoing closed tabs, open a tab with a random website I visited some time ago. Like right now, I opened a tab with google and then closed, I then pressed ctrl+alt+t and it opened facebook, wich is a site I had opened like 10 pages ago

This can be a problem with the file [http://kb.mozillazine.org/sessionstore.js sessionstore.js] and sessionstore.bak in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Profile Folder]
Delete the files sessionstore.js and sessionstore.bak and any existing files sessionstore-##.js with a number in the left part of the name like sessionstore-1.js to prevent Firefox from restoring a previous session.
See http://kb.mozillazine.org/Session_Restore

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