Interestingly, my Firefox (13.0 on Ubuntu 11.04) consistently freezes for any WebGL example. The CPU load will just go full whack and nothing is every displayed

Interestingly, my Firefox (13.0 on Ubuntu 11.04) consistently freezes for any WebGL example. The CPU load will just go full whack and nothing is every displayed. Eventually, I have to kill the process and restart the browser. Does anyone experience the same effect?