[zimpenfish]

> Trading functionality that relies on DOM/media queries for privacy is totally valid

Perhaps it should be a site-specific permission like the microphone or camera. Your generic news site doesn't need that functionality (and shouldn't ask for the permission - you'd know something shady was going on) but your browser-based CAD tool would and you'd grant it there.

[ringaroll]

This will cause a permissions fatigue. Only the most sensitive things should have permission. The usage of these capabilities is large enough that it should not be behind a permission.

[CharlesColeman]

If we went down this path, I think that the any permissions dialog would come at the end of a very long PR campaign and feature ratcheting to get developers to update their sites to not need the permission unless absolutely necessary. Sort of like what's happened with the deprecation of Flash.