Firefox 3.0 + Firefox 2.0.0.14

[EMCGFX]

I've finally go Ubuntu 8.04 final working, everything but firefox, well kind of. I've removed default installed Firefox 3.0 and installed Firefox 2.0.0.14 manually. But now my Java/Quick/Real and other plugins does not work, only flash works Infact when I type "about:config" I see this > screen shot <

Is it possible for me to install Firefox 3 in separate directory ? So it won't over right my "/home/[username]/.mozilla/firefox". Can I use firefox2 and firefox3 profiles ? I want to use both versions because, at this point I don't like some features in 3.0 and since its beta version its not as stable.

If not, then maybe its possible to fix that plugins problem in version 2.

Any help, will be appreciated. Thank You.