I was running Firefox 3.something on my old comp and it ran fine. Installed the latest version on this one and this afternoon, I packed it in and uninstalled FF and went back to Internet Explorer. It wouldn't even let me check my email and was quite dodgy with forums. IE seems to be just plugging along just fine.
Not a happy camper with Mozilla at the moment. Seems like they took a good product and managed to screw it up.