Oh, so your experience with IE 6 is that it doesn't lose focus? Can anyone else comment on their experience? I'd love to know if this is just me.

As for extensions, I am not sure if you mean add-ons, or toolbars, or something else, or all the above, but I don't believe I have anything unusual... Google toolbar, McAfee SiteAdvisor (great product, although the behaviour I mentioned occurred before this was installed), Alexa toolbar, Shockwave flash, Java console, stuff like that...