Submission + - Are we fast yet? ask the Firefox team (arewefastyet.com) 2
Although, as they say "are we fast yet? NO" they seem to be getting closer and closer to Chrome and Safari performance. Traced fatval "Jaeger-monkey" engine could hypothetically even equal or surpass Chrome's speed in the near future (mid-august) according to the data available.
However, it's a shame that they couldn't run Opera's and IE's engine yet on their test platform.