Rated 1 out of 5 stars
Congratulation on the new editor, without UNDO/REDO option, and ctrl+Z / Y option don't work.This review is for a previous version of the add-on (188.8.131.52-signed).
The editor is actually provided by Firefox. There is a bug report to add undo/redo key support - https://bugzilla.mozilla.org/show_bug.cgi?id=683172 . If this isn't fixed by the time Firefox 8 is released, I will implement a workaround.