mozilla/browserid — pull request #3132 by 6a68 (2013-03-22 20:32:35+00:00)
Title: add P3P headers to endpoints IE might care about

I split this off from the main blob of third-party cookie discussion.

Add P3P headers to IE family browsers (a little searching suggests IE9 and, presumably, IE10 also care about this header).

Do I need to add tests to confirm this header is appended if the user-agent header contains an IE-like string?