After being required to "upgrade" to a new laptop (a Dell D600), I decided to make the switch: wean myself off IE and start using Mozilla Firefox. And I have to say, I've been really impressed. It renders faster than IE and consumes fewer resources. It's got an integrated google window and supports tabbed browser windows. All nice features.
It is also quite strict in its Javascript compliance, which causes a few web sites to break, including, much to my consternation, the CCNet web page. The root of the problem is that we use "document.all" in our collapse/expand region javascript (which we inherited from Microsoft btw). Well, apparently "document.all" has been dropped from the Javascript spec in favour of "document.getElementById()". http://www.metalusions.com/backstage/articles/8/.