And apparently so does docwhat.
Since I began to get really proficient at vi(m), I started to wish that Netscape (then Mozilla (and now Firefox) ) had a plugin for vi-style editing of text boxes. Oh, how I searched and searched.
Today, I found something nearly as good. Better in a lot of ways, really. It's called It's All Text!, a firefox extension that allows you to launch your favorite editor to populate a textbox. Just save the document that you're typing, and voila! The text goes into the box.
I used gvim to type this entire blog entry. If I can figure out a way to get it to launch automatically whenever I click in a text box, I might be able to die a happy man.