[RootbeaR]

"Firefox extension Text Area Resizer & Mover does just what the name implies—but with a powerful set of options to tweak the controls however you would like.

Once installed, you can resize a text input or textarea box by simply holding the right mouse button and dragging, or actually drag the text box somewhere else on the page by holding the left button and dragging at the corners."
http://lifehacker.com/5284891/text-a...-comment-boxes