Released just this morning is the latest incarnation of Phoenix/Firebird/MozillaBrowser (It's called Firebird at this stage)... you can grab your copy and check out the full release notes here.

We're still testing it out, but our first impression is a good one. The preferences/options window has completely been redone... there is a new minimal and very clean default theme... and we're told that the bugfixes were numerous.

If you're going to give Firebird a try, be sure to install it to a new clean directory, and create a new profile. Not doing so will definitely cause problems.