http.headers.Referrer-Policy - The browser compatibility for no-referrer-when-downgrade, origin-when-cross-origin, and unsafe-url is not entirely correct for Firefox

What type of issue is this?

Incorrect support data (example: BrowserX says "86" but support was added in "40")

What information was incorrect, unhelpful, or incomplete?

The no-referrer-when-downgrade, origin-when-cross-origin, and unsafe-url are marked as unsupported on Firefox. However, these three policies are ignored only for cross-site sub-resource loads.

What browsers does this problem apply to, if applicable?

No response

What did you expect to see?

I would like to see that there are footnotes to describe where does these three policies get disabled.

Did you test this? If so, how?

Yes, I tested this via this link.

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/Referrer-Policy

https://blog.mozilla.org/security/2021/10/05/firefox-93-features-an-improved-smartblock-and-new-referrer-tracking-protections/

Do you have anything more you want to share?

Nope

MDN URL

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

MDN metadata

Start with the Referrer-Policy compatibility data associated with the MDN URL and review the linked Mozilla documentation and Firefox behavior. Verify how the three policies behave for cross-site sub-resource loads, then update their support data and footnotes so the documented limitation is represented accurately.