Disable unnecessary extensions and plugins and Firefox 7 will be instantaneous and memory efficient.

Right now on OS X Leopard I have Hacker News, Slashdot, CNBC and Huffington Post (yuck) open in FF 7.01 and FF is using 179 MB.

When I had Firebug and the Stumbleupon tool bar enabled as well as some useless plugins that were enabled by default for media types I don't use, these same tabs were using 440 MB.

Google controls my email, phone, SMS and search information, I will not give them browser level access even if they let you opt out of data collection.

I like Firefox, it works great now and is rapidly improving. Mozilla's rapid release cycles should be applauded.