Among the features of Mozilla Firebird is the simplicity ff the install: Thw Win32 binary download is a zip file and you just extract that and run.
It is testament to the sad state of consumer software that you involuntarily need to struggle with this simplicity. You find yourself looking for the SETUP.EXE file in the distribution, but there isn't one because it isn't needed.

One feature they should add to the Win32 browser though is the ability to register the browser a little better with the registry so that the Installshieldy plugins can go about their complicated ways. Of course some of us wish that all the flash sites would just go away and die anyway, so this may be a feature and not a bug in the browser.