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After a crash, how to I restart in the restored session tab?

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I cannot always be sure FF will restart in the last tab I was working on: sometimes it starts in that tab, but another time it will restart in the leftmost tab.

I cannot always be sure FF will restart in the last tab I was working on: sometimes it starts in that tab, but another time it will restart in the leftmost tab.

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There is no guarantee that Firefox will open what you last had opened when the crash occurred. Could you provide you crash ids by going to "about:crashes" with quotes in the URL bar?

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Note that Firefox stores session data every 15 seconds (browser.sessionstore.interval), so in some cases the information about the last tab selected may not be saved properly.