After I've installed google-chrome (not chromium), I noticed that it completely overwrote any behaviour set for the default browser, thus resulting in any link clicked in the GNOME environment being opened in Chrome, instead of my actual default browser, Firefox.
Just about any browser I know, Including Opera, Midori, Rekonq, Dillo, Icecat (and a bunch of others) honor the 'default browser' settings, WITHOUT screwing around with global .desktop files.
Even after manually searching for everything possibly related in gconf-editor, I was not able to get rid of this behaviour, and restore firefox as the default browser, so help is very much appreciated.
PS: Please spare me your "why don't you just switch to chrome instead?" - I have my reasons, and this is certainly not the place to discuss them!