Change Firefox's "View Source" Default Editor

If you often need to see the page source in Firefox (using "View Source"), then you know how irritating it is to see the code in Firefox's default text editor which does not include syntax highlighting and other cool features. But you can change the default "View Source" editor by typing:

about:config

then search for:

view_source.editor.external

and toggle it to True, then search for

view_source.editor.path

and modifiy it with the path to your favourite editor. I use Ubuntu, so for my editor i added the path to GEdit: /usr/bin/gedit