Firefox Problems

Firefox gives me problems that just happen randomly.

I can just be browsing and then all of a sudden no links work. I can click on them like crazy and nothing will happen. Also sometimes search stops working and the back button stops working. I'll have to restart the browser anytime something like this happens.

I also get the issue with crashing. I could be browsing with only one page open and Firefox just likes to randomly crash on me.

Anyone know why I'm having these problems?

I'm running Firefox 2, but I've had these same problems and more with Firefox 1.5.