Comment by rlm

  Moreover, I know that I will be facing with more crashes with a beta.

Firefox 3.0b5 hasn't crashed once on my laptop (Ubuntu) or desktop (Vista), and I've been using it since it got released.

On top of that, I can't imagine what you have done to your Firefox 2-install, if it crashes that often and you reach that high CPU- and memory usage.

Something besides the main Firefox install must be fubar'ed...