There was an attempt to address Mozilla's concerns[1], but Mozilla never responded, unfortunately. If the Mozilla community chooses not to respond, that might cause people to consider whether or not their position should be given much weight.
What do you mean they never responded? They say they are working on a response[0]. Taking time to respond and informing the other party that it will take a while is not "never responded".
3 months is a long time.... how long is someone supposed to wait for a response before you just move ahead? If the answer is "forever", it becomes trivial to perform a denial of service attack on a standard. Mozilla specifically said, "this is not high priority for us". If it's not high priority for them to respond, that's fine, but waiting forever doesn't seem like a reasonable thing to require.
I am against this standard. First, I want to see the real URL in the address bar. Second, I don't want Mozilla to spend resources to implement specification that is made by Google for its own purposes.
[1] https://github.com/mozilla/standards-positions/issues/29#iss...