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Looking for “Save and Quit” function when closing a window with multiple tabs in Firefox 4?

There’ were some changes for some of the warning messages in Firefox 4 and it doesn’t allow users to modify these changes in “Tools – Options”. However, you’re still able to set this hidden pref to what you want – A Warning When Closing Multiple Tabs with following steps.

1. Go to the location bar (URL address bar), type about:config and press enter.

    

2. Click on “I’ll be careful, I promise!” to proceed.

3. Type browser.showQuitWarning in the Filter bar at the top.
   

4. Set the default value “False” to “True” by double clicking that pref.
    

5. Restart Firefox.

If you just want to restore previous closed sessions whenever you run Firefox 4 without any hassle, just go to “Tools > Options > General > Startup: "When Firefox Starts": "Show my windows and tabs from last time".

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