Ok, someone put a Firefox app in the Marketplace. Who's going to try it? No reviews so far and it's $1.99 without a trial.
http://www.windowsphone.com/en-US/apps/f2d0ea49-4c74-4733-afad-efd00cfe2fe8
http://www.windowsphone.com/en-US/apps/f2d0ea49-4c74-4733-afad-efd00cfe2fe8