Originally Posted by MiK546

Ok, sorry, I was wrong (should have read the thread properly...), you HAVE to use X Terminal, but its pretty easy:

1. Install leafpad (if you haven't already) (sorry, you have to install it, but it isn't big and can be found from Extras trough application manager)
2.Close all your browser windows
3.Open X Terminal and write

Code:

killall browser (enter)
cd .mozilla/microb (enter)
leafpad prefs.js (enter)

4. Now you should be in a texteditor-window. Scroll to the bottom of the file and then paste the following there:

Code:

user_pref("network.protocol-handler.warn-external.sip", false);
user_pref("network.protocol-handler.warn-external.tel", false);

5. Save your changes and close the leafpad and Terminal -windows
6.Enjoy!