It's here! It's here! Well, if you're brave! Firefox
5 isn't the official release listed over at Firefox.com, but that doesn't mean that it's not out yet. A few folks who poked and prodded within Mozilla's FTP listings find that v5.0 actually is out, officially, but you'll need to do a little undercover work to discover it. This newest version adds support for CSS animation, an easy-to-find Do Not Track setting, and not a ton of user interface tweaks. For the most part, it looks and acts like Firefox 4.
If you have nothing better to do on a Sunday, you might as well give it a go and see if drains fewer resources than past versions, or if it feels more stable. Otherwise, be patient and wait for the final-final version to hit the website. It'll be tough to resist, we're certain.