Lion full-screen (http://bugzil.la/639705) is coming in Firefox 14, which will be released six weeks from today (https://wiki.mozilla.org/RapidRelease/Calendar). You can use it now on the Aurora channel (https://mozilla.org/firefox/aurora/) and in a few days it'll also be on the Beta channel (https://mozilla.org/firefox/beta/).

Lion-style scrollbars (http://bugzil.la/636564) are still in progress. You can test them on the UX branch: https://msujaws.wordpress.com/2012/03/15/mozillas-ux-nightly...

I don't get Mozilla. The first OSX Lion developer preview came out in March of 2011. This kind of (very) slow adoption of platform improvements is the worst way to win users, and by extension power, to fulfil their mission of a free and open web.

I honestly can't think of an excuse for not supporting Lion specifics this late in the game.

OSX support requires OSX contributors. So don't ask Mozilla what the excuse is, ask your fellow OSX programmers.

Mozilla take in millions a year from Google. If nobody is contributing to a major platform - pay someone to. I don't even own a mac, but simply can't understand how Mozilla are failing so badly at it.