Emacs as a web browser's external editor
- Firefox family (Iceweasel, Conkeror, etc)
- Firefox add-on It's All Text! works with Emacsclient to allow the user to edit text in Emacs and send the results to the browser textarea with [C-x #] (or M-x edit-server-done).
- Webkit family (Safari, Chrome)
- The Chrome extension is described on Edit with Emacs.
- Internet Explorer