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Firefox will not start a new session, every time I start FF up again.

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Whenever I start up Firefox it always restores the previous session. I have selected the option that starts a new session every time FF is started, but it still restores the session. It suddenly started one day, and won't return to normality again.

Whenever I start up Firefox it always restores the previous session. I have selected the option that starts a new session every time FF is started, but it still restores the session. It suddenly started one day, and won't return to normality again.

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You can check if you have an user.js file in the Firefox profile folder that sets the browser.sessionstore.resume_session_once pref to true.

You can use this button to go to the Firefox profile folder:

  • Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)

See also:

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Another theory to pursue if the above doesn't help: Firefox may resume a previous session if it detects that it did not shut down correctly after the previous session (i.e., if it thinks it crashed).