I installed the nightly build of Mozilla on my XP box and my Mac last night. Here is the first thing you see upon download. Which is the hard way? 304 to one XP wins as most complicated.
Almost all of the exact same jar files are used to create these two applications, the mac just hides them from you. If you really want to see the pile-o-files, just “right click” (yes that works on a mac) or control-click the icon and choose show package contents. Jar yourself out.