Restore save and quit in firefox

The new version of firefox version 4 is great, fast, nice new interface.developer friendly and much more but some people are not feeling good with firefox and complaining cause its missing the save and quit feature when closing firefox 4.

Here is the tutorial to restore that option and enjoy firefox to its best.

1. Type about:config into the location bar and press enter

2. Accept the warning message that appears, you will be taken to a list of preferences

3. Locate the preference browser.tabs.warnOnClose, if its value is set to false, double-click on it to change its value to true

4. Repeat this for these 3 preferences browser.warnOnQuit, browser.warnOnRestart and browser.showQuitWarning.