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#725120
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enter "about:config" in the address bar to get the list of user preferences
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type "browser.startup.page" in the filter
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right-click to modify the value from 1 to 3 (1 is the default that opens the browser to the homepage only; 3 is the setting that tells Firefox to always restore the previous session)
From there You can shut down firefox and it will auto restore the tabs even tho you closed them. :-)