So my Firefox just upgraded itself to version 4, and to start with all seemed well. But then it kept freezing all the time. YouTube can't stream properly, flash games make it non-responsive for a while. Good old 3.X was absolutely fine. 'But its an add-on/extension' you say. So I took them all off and did a clean re-install. No good. Looked on the Firefox website, it says I can access a log of all the crashes. But nothing there about it freezing...
Now I like Firefox. I have used it for a long time. But I am not alone in these issues, a Google search showed up many people with similar issues. These days I have lots to do, so I am sorry to say I just cannot be bothered.
Chrome it is.