Something similar happens to me, but it happens to me since I installed kernel 2.6. I'm using Slackware. Since then my Firefox freezes some time ramdomly when I click on a text input box on a website or on the URL bar on the navigation toolbar. Eventually, some of these times, Firefox closes. I'm using the official Mozilla buid of Firefox 0.8, and also tried the last nighly build (all the same).
This is very frustrating, there must be any way to solve this problem.
Any result?
Thankyou in advance, and sorry about my english level!