> However, how this plays out with browsers that allow extensions or are modified remains a grey area. As the proposal vaguely mentions, "Web Environment Integrity attests the legitimacy of the underlying hardware and software stack, it does not restrict the indicated application’s functionality."
That's not vague at all.
This would be entirely in line with financial incentives of the proposed attesters and even logically defensible (oh well, we haven’t vetted uBlock, so you can’t browse with that installed).