That's me. Sorry, but I just can't be bothered to support every browser's quirks. I check Firefox every once in a while, but really, I don't mind losing a few users if it means significantly less maintenance and testing for me.
It's like complaining that developers are increasingly shunning other OSes - if it works on Windows, it's ready to ship. Yet people do this all the time for video games and most Linux users understand that making a game that runs equally well on Windows and Linux and Mac is no simple task.