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I find the new tab groups feature of Firefox 4 amazing and useful, but what I don't find amazing and useful is the fact that your tab groups are not persisted between sessions of opening and close and re-opening the browser.

Is there a plugin to implement this functionality?

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up vote 1 down vote accepted

By default, Firefox 4 will not prompt you when you close your browser like you were in Firefox 3. It implicit assume user wants to close the browser without saving the tab.

To bring back the function, simply open a page to about:config and set browser.showQuitWarning;false to true.

I wish there is a button to enable this, but the trick above worked for me.

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That did it! I don't know why they don't enable that by default it almost makes the feature useless. – leeand00 Apr 11 '11 at 18:49

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