To get this editor to work, you will have to do the following.

1. add the line below to defaults/pref/all.js:

pref("security.checkxpconnect",false);

this will give the editor access to xpconnect.

2. comment out this line:

/***
pref("security.policy.default.location.tostring.read", "sameOrigin");
***/

This will let you load more than one URL from the help menu.

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What is currently working you ask??

Well, not a whole lot *yet* . . .

But if you load in the javascript toolbar, you will see some syntax highlighting going on.
It has a ways to go but it is a start.