Browser.send pings.require same host
From MozillaZine Knowledge Base
The Web Applications 1.0 specification (also known as HTML5) defines a new attribute for
This preference determines whether the URIs to ping must be on the same host as the current page.
Possible values and their effects
Only ping the URI if it has the same host as the document containing the link.
Allow third-party hosts to be pinged. (Default)
First checked in
Has an effect in