I wondered wether you can change the default webbrowser in Mozilla mail in order to use the fast and gorgeous Safari. I searched but I only found a hint to change the mail handler when using Mozilla as a browser. After a bit of experimenting, this is how to do it ... it's about the same as the other hint, you have only to exchange mailto with http:
user_pref("network.protocol-handler.external.http", true);
You have to add this to your pref.js file in ~/Library -> Mozilla -> Profiles -> etc., as explained in the original hint.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20030717132957545