It's All Text! 1.3.1

"Edit textareas using an external editor, because it's all text!

Right click on a textarea, select "It's All Text!" and edit the text in the editor of your choice.

Alternatively, click on the edit buttons added for your convenience. Right click on the edit buttons for even more options, including preferences."

https://addons.mozilla.org/en-US/firefox/addon/4125