I just posted a bounty on one of my questions and I noticed that the rendering is off. The vertical lines on the far left (where it says "Enter a custom message" the E does not have the vertical line, just the three horizontal lines). This is true of all the text on the far left side.
I'm guessing that since not that many bounties get awarded this has not been been caught.
In case someone wants to reproduce this, I'm using FireFox Portable 20.0.1 on Win7 x64.