Firefox uses Evolution, but I use Thunderbird

[Thomas Kaiser]

I use Thunderbird as my Email client. Evolution is still installed on my 
system.

If I click on an Email address in the webbrowser (Firefox) it will open 
Evolution for sending a mail. I could not find any refernces to Email 
programms in Edit->Preferences of Firefox.

How to tell Firefox to use Thunderbird as the Email client?

Thanks In Advance, Thomas