Yes, I got that from your post. It's just that for Google, proposing it again with harmless content is very easy, but for anybody else to filter the bad content once the Google proposal gets accepted is almost impossible. (Although, if I was working on Firefox, I would just copy the most common data from Chrome, adjusting for those 2 fields that matter. That would create problems, but it's the less problematic choice.)
So, no, it should be rejected. Entirely and severely. It doesn't mean that contextual headers are a bad practice, it's just that this one proposal is bad.
