100% TextArea In FireFox Using Absolute Position

I'm trying to make my textarea to fill all available space, I used: I can't use 100% width & height as I have margins & paddings all over the place, I have to use absolute

Solution 1:

Mr Snook failed back in march last year, but he suggested a way you could solve it:

wrap the textarea in another element

Does this in any way help you?