Rated 5 out of 5 stars
The SU Editor just keeps getting better and better. I've followed this editor since it's humble beginnings as an SU v3 Greasemonkey script. This FF add-on version is the most robust yet.
Minor suggestion: The "SUEditor is On" icon in the status bar takes up a bit too much room. Maybe you can reduce it to an icon for v0.0.4?