>>12
I had already found that list for md5s but it doesn't contain firefox.exe.
Are you sure, I'd imagine this is the one (if you downloaded the installer for the win32 build of Firefox 1.5.0.3 with the en-US locale (which is generally what people use, so other locales are translated from it, generally, I guess)):
0103d4fbeb3e49f2eb4b746c26ada42add546e94 ./win32/en-US/Firefox Setup 1.5.0.3.exe