Is there a way of setting firefox as default browser i mdk 10.1 official?

mandrake menu->preferred applications

hmm... cannot find any preferred applications i menudrake. I assume this is what you mean with mandrake menu?

Have alredy set the file association for html files to firefox. But i still have problems with thunderbird

One of the things you need to do is add the following line to your prefs.js file under your .thunderbird/xxxx.default directory:

user_pref("network.protocol-handler.app.http", "/usr/local/firefox/firefox");

Don't do this while Thunderbird is running otherwise you'll lose the changes.

The second thing I did was change the symbolic link for my kde browser under /etc/alternatives

lrwxrwxrwx 1 root root 26 Nov 21 14:49 webclient-kde -> /usr/local/firefox/firefox*

I deleted whatever was there previously and setup a link to firefox. (see http://www.die.net/doc/linux/man/man1/ln.1.html).

Regards,
Crispus

Oh, I forgot to mention that /usr/local/firefox is where I installed firefox, so you would need to change the path in both recommendations to match your installation.

Regards,
Crispus