I switched from Firefox 2 to Firefox 3 a few days ago and love the speed of the new version of Firefox. It's not a speed gain that's only appearing in benchmarks but one that every user will recognize as well. There was one minor incident though after upgrading to Firefox 3 that turned out to become a huge problem. Firefox 3 was frantically writing on my hard drive and raising cpu usage periodically which brought the browser to an complete halt in that time.
It usually lasted for 30-60 seconds and everything turned back to normal afterward. I first thought it had something to do with the Live Bookmarks and how Firefox was updating them but it turned out that this was not related. I read that the bookmarks would be saved in a database and not in an html file anymore which is why I though it could be the reason.
I eventually discovered a thread in the Ubuntu forums entitled Firefox 3 is eating my hard drive which lead to a bug report at the Mozilla website and a fix for Linux. My problem was that I was using Windows and not Linux and had the same symptoms.
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