Dred, in the Services, disable "Security Center". That will kill that annoying pop-up ballon and tray ICON.
From a performance perspective, I see no difference between FF and IE. I see a lot of W3C short-comings in FF. Most of them are just little things which does not stop a page from being viewed. I am just sensitive to them.
Its the Sun Java crap that is a problem. And it really is not the Sun Java crap, it is the WEB pages which assume IE is the browser being used. So they use proprietary IE crap. I hate that as well.
If I could did not have to use the Sun Java crap, then I would not mind FF, but as it stands, I see no benefit to switch. 99.9% of the problems most people have with IE have to do with using the default settings MS ships it with. Once you have it configured to approximate FF's configuration, then there is really not much difference between the two.
I just see no reason to change to FF. Unless I really enjoy program crashes due to the Sun Java crap.
Let me be clear here. I am not a proponent for IE nor anything related to Microsoft. But I do not see FF as a better solution.