Hrrm, to have both versions of firefox could be tricky. I think you'd run into conflicts if you do both as an rpm--you might consider getting the 32 bit one from mozilla. (In which case, its a tarball, you untar it, and it creates a directory called, oddly enough, firefox. At that point you can run it with firefox/firefox. (Assuming you're in the directory where you've untarred it.
The Sun java shouldn't be an issue, IIRC, I've managed to have them both without problem.
Do NOT PM forum members with requests for technical support. Ask your questions on the forum.
"I don't know why there is the constant push to break any semblance of compatibility" --anon