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i WORK WITH 20+ TABS OPEN, SOMETIMES IF A WINDOW IS ALSO OPEN AND I DON'T CLOSE IT FIRST, MY TABS DON'T REOPEN WHEN I RESTART FIREFOX-HOW CAN I FIND AND REOPEN?

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I understand how to set the restore tabs function and have done so. Usually my tabs reopen when I restart, but every once in a while if I have other windows (not tabs) open, and I forget to close them all first, before I close my main window, then when I reopen, my tabs are gone. I have gone to History and I can see the Restore Previous Session and Restore Closed Tabs commands, but they are not highlighted and they don't work. Please advise

I understand how to set the restore tabs function and have done so. Usually my tabs reopen when I restart, but every once in a while if I have other windows (not tabs) open, and I forget to close them all first, before I close my main window, then when I reopen, my tabs are gone. I have gone to History and I can see the Restore Previous Session and Restore Closed Tabs commands, but they are not highlighted and they don't work. Please advise

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Try using the Firefox button > Exit when you go to close Firefox, that should save all your open windows / tabs.