api.HTMLObjectElement.contentWindow - null in Firefox if same-origin policy is not met in v112

What type of issue is this?

Browser bug (a bug with a feature that may impact site compatibility)

What information was incorrect, unhelpful, or incomplete?

If same-origin policy is not met, Firefox now returns null for object.contentWindow, version v112.

What browsers does this problem apply to, if applicable?

Firefox

What did you expect to see?

compatibility table extended (?)

Did you test this? If so, how?

yes, Chrome, Edge, Safari, FF

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

could not find info among FF releases:
https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases

• checked 114 - 84 (released on December 15, 2020, yet most probably FF bug was introduced in v114).

Do you have anything more you want to share?

No response

MDN URL

https://developer.mozilla.org/en-US/docs/Web/API/HTMLObjectElement/contentWindow

MDN metadata

Start with the MDN HTMLObjectElement.contentWindow page and verify the reported Firefox behavior against the linked browser tests and release information. Confirm the affected Firefox version and the expected compatibility result before updating the corresponding browser-compatibility data; the issue is done when the table accurately records the confirmed behavior.