Update: We've also run Kraken 1.1 and the v8 Benchmark Suite version 6 on the same browsers - these numbers come a bit closer to realizing the 30 percent improvement over version 8, while even more conclusively demonstrating how far Firefox has come since version 3.6.
Firefox 9 also brings two-finger navigation to users running OS X Lion - swiping left on a multitouch device will go back, and swiping right will go forward. Safari and Chrome have already implemented this feature, and while the functionality is the same in Firefox, those browsers include visual cues (arrows in Chrome, a visual sliding of the page in Safari) to let you know that you're doing it, visual feedback that I find helpful. There's still no support for fullscreen mode, though plugins exist to give this functionality to those who want it.
The rest of the improvements can be found in the usual laundry list of small security and bug fixes (including one I had run into where attachments wouldn't download properly when using the Outlook Web App - useful information for shops running an Exchange server). You can get the new browser by using Firefox's built-in updater or by visiting getfirefox.com.
Note: At the moment, Mozilla says that it's not pushing Firefox 9 out to OS X and Linux users automatically because of "a possible issue affecting a small number of users." We'll keep an eye on this and update the post as events progress.
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Barfo - Wednesday, December 21, 2011 - linkIt does seem generally faster to me.
bachinchi - Wednesday, December 21, 2011 - linkApart from new 64-bit builds, this shouldn't have been tested with Sunspider. All new browser are now around 200ms. v8bench or kraken are newer benchs and should be used.
Andrew.a.cunningham - Wednesday, December 21, 2011 - linkThanks for the suggestion. I'll throw up some quick V8Bench numbers in a few minutes, though they don't really change my overall impressions much.
bachinchi - Wednesday, December 21, 2011 - linkThanks for the quick update!
smitty3268 - Wednesday, December 21, 2011 - linkYeah, I think Mozilla and the other browser vendors have officially declared Sunspider done - it's fast enough now that they don't foresee any future improvements to the scores, and any that do pop up (like the 9ms gain here) are incidental.
The V8 benchmark, incidentally, is heavily limited by the garbage collector right now - which happens to be one of the next things Firefox will focus on in a few months.
gss4w - Wednesday, December 21, 2011 - linkShould be "Type Inference" instead of "Type Interface." I don't normally point out typos but since interface and inference are both valid words but mean different things I thought it was worth pointing out.
Andrew.a.cunningham - Wednesday, December 21, 2011 - linkThanks for the note - not sure to blame myself or spellcheck for that one. :-)
cyberguyz - Wednesday, December 21, 2011 - linkSorry Mozilla. I can't keep up with you anymore.
I'm getting to the point where I can't see the difference between you and Microsoft. At least they are not hitting me with full releases every couple months.
jcompagner - Wednesday, December 21, 2011 - linkand Chrome does the same,
you shouldn't see this as major releases.. just continues releases...
neothe0ne - Wednesday, December 21, 2011 - linkWhy exactly is a new major version number killing you when the application itself looks the same and it _only_ performs much better than before?