Chrome and Safari are supported. I have no plan to support Firefox. If someone is interested to make it work on FF or elsewhere I'm posting the GitHub soon.
It doesn't work for me either. I'm on Firefox.
That website's markup is incorrect. There are also no <html>, <head>, or <body> tags in that webpage either, which might be a good explanation of why.
Man, you don't understand :)
I don't use FF either, but by intentionally abandoning HTML standard you make yourself vulnerable to issues in Chrome, Safari or whatever you use. New version comes out, and your site's broken.
It's not hard at all to comply to HTML standard, and just stop worrying about compatibility. Then you wouldn't even say the words "don't support <somebrowser>", because it's their problem that their browser doesn't follow standard.
It's kind of distorted.