So, basically, they noticed some potential insecurities in the implementation proposed by Google. Instead of negotiating modifications to the spec like adults, they threw their toys out of the stroller and refused to participate.

What a bunch of idiots. They seem to have a completely misguided concept of what a browser is. They still have a 1990s mindset of the browser being a window into the Internet, instead of the universal UI that it has become today.