Horizontal scrollbar.

First of all: I love this site and I love Blander. Ok, I have problem that I always got a horizontal scrollbar. I use Firefox, and yes I always use strange window sizes. Currently it’s:
hwnd: 357,6 [1020, 1039]
so it sits nicely in the middle of my screen. It’s the latest FF on win7. Any tips how can I make the horizontal scrollbar go away?