Mozilla Firefox and Thunderbird

[Andrew Konosky]

I use Firefox and Thunderbird for internet and e-mail for both windows 
and linux, but in linux I am not sure how to set them as default 
applications. In Thunderbird, when an e-mail has a link in it, the 
mozilla browser is opened rather than firefox when I click on the link. 
In Firefox, mailto: links open Ximian Evolution and asks me to setup an 
account every time. How do I set Thunderbird and firefox as the default 
mail $ browser applications?