A big thanks to Christer Edwards for posting on the fantastic Firefox plugin called It’s All Text!

I just started using it on the Fedora wiki and it is superb for large and complicated edits.  Make sure you enter the full path to the text editor you add to the preferences or it won’t work.

After installing It’s All Text you’ll soon see a little blue edit box on certain web pages which, if you click on it, activates your specified text editor.