Gentoo Firefox Issue Solved?

So far, I would say yes. This Gentoo forum post describes the issue I had while running 64-bit Gentoo and had again with 32-bit Gentoo where an X window (or as described by one poster, unmarked windows) would pop up while using Firefox and Firefox would eventually crash. The Gentoo bug page for this problem shows a solution of compiling Firefox using a +moznopango use flag. I recompiled Firefox with that use flag and have had no problems for 3 days. As a bonus, most of the text in Firefox looks a lot better. I'll be using the +moznopango use flag when compiling the 2.0.0.6 version of Thunderbird and the next version of SeaMonkey.