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Eanbling FireFox Save Tabs on Close

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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