Vimsert

Vimsert is a simple open-source extension that allows you to open up a code editor for any textarea. It is based on the Ace editor, with vim keybindings enabled.

Contribute to it here: http://github.com/gabesullice/vimsert

Controls:

Open editor: Ctrl + i (while in a textarea)
Write changes: Esc, :w
Close editor: Esc, :q
Write, then Close: Esc, :wq

This project uses the Ace code editor. Information can be found here: http://ace.c9.io/
It is licensed under the BSD license, which you can find here: https://github.com/ajaxorg/ace/blob/master/LICENSE