[wellylug] default web browser change for Icedove

[Colin & Josephine Lewis]

My Icedove email client uses Gnome web browser as its default, which I 
find a pain as I prefer using Ice Weasel (Firefox) for all other web 
searching.  I have looked through the Icedove settings but cannot 
immediately see any default web browser setting to change this.  Does 
anybody know how I can do this.  I am running Debian with Gnome desktop.

cheers

Colin