Wouldn't it be easier to get the 32-bit Firefox, and do this:
Code:
convertpkg-compat32 -i mozilla-firefox-3.6.6-i686-1.txz -o mozilla-firefox-compat32-3.6.6-x86_64-1.txz
Install it, get the 32-bit Flash, and put libflashplayer.so in /usr/lib/mozilla/plugins. That's what I've done and everything works OK.