* Being able to disable unnecessary features and phoning home using about:config is great
* Extensions look and feel more native (this will probably change because Mozilla has decided that cloning Chrome is the way to go)
* Extensions are more capable, still no decent side tabs in Chrome
* They're not an ad agency, so they don't ban extensions they don't like or nag you when you install something unapproved
* Font rendering manages to not look terrible
I'll admit though, Chrome still kills Firefox on UI speed and in many security technology ways. My biggest worry is that Mozilla will fail to achieve Chrome UI speed while ditching the things that make Firefox unique today.