I switched browsers from Iceweasel to Chromium a while ago. I finally got around to looking for an extension that would allow me to edit text areas in Emacs rather than in the browser, in a fashion similar to Iceweasel's "It's All Text" extension.
So I installed Edit with Emacs. I'm writing this post with it as the first test. You'll be able to tell if it works right at about the same time as I can.