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In a "restore session" window I accidently clicked on "start new session" rather than "restore previous session". Is there a way to restore/recover tabs from previous session after starting new session?

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Firefox crashed after updating an addon. When I restarted the restore session window appeared. Problem is I clicked on start new session rather than on restore previous session and lost about 12 tabs.

Firefox crashed after updating an addon. When I restarted the restore session window appeared. Problem is I clicked on start new session rather than on restore previous session and lost about 12 tabs.

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You can check the Firefox Profile Folder to see if there is a file sessionstore.bak

If you find such a file and it has the date/time from around that crash then make a backup copy elsewhere and rename the file to sessionstore.js

See http://kb.mozillazine.org/Session_Restore