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I downloaded version 4 of Firefox, and it no longer saves my open tabs when I close Firefox, how do I reset this to save my open tabs?

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After I downloaded the version 4 of Firefox, it no longer asks me to save the open tabs I have when I exit or shut my system down. I loved this feature previously. How do I get it turned back on?

After I downloaded the version 4 of Firefox, it no longer asks me to save the open tabs I have when I exit or shut my system down. I loved this feature previously. How do I get it turned back on?

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I had the same problem and found the answer after Googling -- not on any official Mozilla page:

Type "about:config" (without the quotation marks) into the location bar and press enter. Locate the preference "browser.showQuitWarning." If its value is set to false, double-click on it to change its value to true.