One change in Firefox 4 is to by default stop Firefox displaying the warning message, but it can be turned back on by changing some preferences.
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 2 preferences browser.warnOnQuit, browser.warnOnRestart
5.Starting with beta 12 there will be an additional preference that needs to be set to true - browser.showQuitWarning
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