It looks good, at least now there is a better distinction.
However, being one who likes making things both clear and concise, I would offer the following potential suggestion: Use icons in front of each one to differentiate the behavior. (e.g. Firefox / firebug icon. or JS/ Firebug icon, etc). This gives you more flexibility for supporting a few more "categories" of commands. Not sure if there is stuff in the "firefox dom" list that could be slit amongst ECMA and "Firefox specific", etc.
Just a thought.
Keep up the great work.