If FF was following the STANDARD that you keep crying about Giz then it would pass the ACID2 test but it falls flat on it's face.
It's called CUSTOMER SATISFACTION and it has nothing to do with what browser YOU like.
If I want to sell you something and it works great for me, but falls on it face for you, guess what.... YOU'RE NOT GOING TO BUY IT from me. That's what is has to do with in a nutshell (IMHO)
