What you've written is a great illustration of what tedunangst said people are doing. The proposal literally is not about extensions. The only context in which

What you've written is a great illustration of what tedunangst said people are doing. The proposal literally is not about extensions. The only context in which extensions are mentioned is to explicitly say that the mechanism is not for policing the installed extensions or other browser features. So how exactly are you determining that this is what the proposal is really about? It seems that it can only be by ignoring the proposal text and making up your own ideas of what it is about.