It's out, www.getfirefox.com
Okay, now that I've tried it a bit here are some impressions! 1.5 looks pretty much as always on the GUI side but I have noticed that all the prompts and error messages have gotten a very Flock feel to them. Almost all of your favorite extensions work; the exception being SwitchProxy tool which is really annoying. For now an alternative extension is xyzproxy but it has its' limitations and is an eyesore. The movable tab function is still a bit sticky if you ask me. I like the "clear private data" function but again it all reminds me a bit of Flock.