Enable Save Tabs Upon Exit
Prior versions of Firefox would ask “Do you want Firefox to save your tabs for the next time it starts?” when exiting the program. This feature with help to restore the previously closed tabs. FF4 no longer has this feature enabled by default. Here is how to turn it back on.
We all want this feature enabled. Why is this disabled in Firefox 4? Here is how to fix it.
1. Open the configuration page by typing about:config in the address bar.
2. In the configuration page search for browser.showQuitWarning in filter.
3. The default value for this entry will be False, double click on it change to True.
4. Restart Browser for effect to take place.