"First note that all the interaction between XUL/JS goes via the nsEditorShell. The lower-level editor interfaces are not (yet) exposed to JavaScript via IDL."
does this still apply?
No, Editor Shell is dead.
where can i gather info about <editor> tag?
Start by reading editor.js and ComposerCommands.js and the other editor js files.
-- Warning: May contain traces of nuts.
