I finally got around to updating my girlfriends MBP to Leopard. With a fresh install, I updated everything then installed Firefox 3 RC2. Shortly after running the browser, it locked. It locked so hard I couldn't kill -9 it, or kill it in activity monitor. To make matters worse, I couldn't restart. I was forced to power down the machine. My MBP is running 10.5.2 and FF 3 RC2 and I have no trouble. However, a few co-workers are also having the same trouble with RC2. Has anyone else had this trouble ?