What's up with DoubleClick and the keyboard API?

Posting here because my searching only lead to other posts by similarly baffled others ;-)

Using Firefox on another computer via X-forwarding over ssh. I look at the terminal briefly, and I see:

No permission to use the keyboard API for http://googleads.g.doubleclick.net
No permission to use the keyboard API for http://googleads.g.doubleclick.net
No permission to use the keyboard API for http://googleads.g.doubleclick.net

I see some discussion in the mozKeyboard should require a permission to use and Limit the usage of the (deprecated) mozKeyboard API to System app only thread.

So, am I seeing this because sites I visit are no longer allowed to use the Keyboard API willy-nilly?