Firefox 4 and later versions save the previous session automatically, so there is no longer need for the dialog asking if you want to save the current session.<br /> Use "File > Exit" or "Firefox > Exit" (Mac: "Firefox > Quit Firefox") if you want to restore multiple windows.<br /> You can use "History > Restore Previous Session" to get the previous session at any time.<br /> You may need to click the orange/gray Firefox button to see History.<br /> There is also a "Restore Previous Session" button on the default <b>about:home</b> Home page.<br /> Another possibility is to use: * [http://kb.mozillazine.org/Menu_differences Firefox/Tools > Options] > General > Startup: "When Firefox Starts": "Show my windows and tabs from last time"