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Perfect Rated 5 out of 5 stars
This very simple add-on does exactly what the developer says it will do. For Mac users, it makes the full screen button put you in the old type of full screen before they integrated support for Lion's version of full screen, which is dreadfully slow and takes up a new space in mission control with every new window.
I'm really glad someone made this, because I down-graded to FF13 just to get tho old full screen back, but was really not liking the idea of missing out on all the new features and fixes that would be coming in what could have easily been the year before Mozilla finally got around to making this a built in option.
But this fixes all of that!