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Old Lion Fullscreen 1.0.1-signed.1-signed Requires Restart
Firefox 14+ only supports Fullscreen mode that is native to Lion. While not everybody is happy with how Lion handles fullscreen mode, this extension reverts the old behavior which plays nicely with Spaces.
About this Add-on
The reason why native Fullscreen doesn't suit everybody is that it (intentionally) breaks Spaces: second monitor becomes useless and it also doesn't seem possible to assign keyboard shortcuts for switching to a fullscreened Space. Once installed, Old Lion Fullscreen reverts the way Fullscreen worked before Firefox 14.