The browser thing? You mean me seeing which browsers that users are usin'?
I don't think there's any need to worry about that, for these reasons:
- If the cracker is able to spread a worm through IF, they'd be able to find out which browser you're using anyway (provided you don't fake it).
- Pretty much everything one might use to do that is disabled anyway.
- Worms are, by nature, non-targeted, so they wouldn't give a damn which user is using which browser anyway.