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=== PREVENT tabs/sessions restoring when restarting Firefox after a forced close/crash ===tested on version: 8.0You can do this by changing a hidden preference. about:configIn the filter box type resume to bring up a small number of preferences, Double-click on the preference browser.sessionstore.resume_from_crash to change its value to false reference: [http://support.mozilla.com/en-US/questions/754840 How do I PREVENT tabs/sessions restoring when restarting Firefox after a forced close/crash?]You can also Set the pref browser.sessionstore.max_resumed_crashes to 0 on the about:config page to get the about:sessionrestore page immediately with the first restart after a crash has occurred or the Task Manager was used to close Firefox.That will allow you to deselect the tab(s) that you do not want to reopen, but will allow to reopen the other tabs.