Feature Policy - Firefox data is all flagged

[lukewarlow]

What information was incorrect, unhelpful, or incomplete?

Firefox support for "Feature-Policy" header all states that it's only supported behind a flag.

What did you expect to see?

Some if not all have been partially supported since Firefox 73 74. Only working inside the allow attribute.

Did you test this? If so, how?

I've validated that for the "display-capture" feature policy it definitely works as of at least version 74.

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Feature-Policy

[lukewarlow]

Follow up issue after noticing more than just display capture was wrong when doing #11700

[lukewarlow]

This data was originally added as a full support in 74. But was later reverted in #9280. It should have been changed to only partial implementations with a note (like has been done for Safari).

[lukewarlow]

Behind the dom.security.featurePolicy.experimental.enabled flag, the following policies are supported. Not sure on exact version they were added yet.

autoplay
document-domain
encrypted-media
midi
payment
xr-spatial-tracking

[queengooborg]

It appears that the data has been fixed at least since the rename to Permissions-Policy, so I'm going to close this issue. If I'm missing anything, please let me know.