api.VideoPlaybackQuality.totalVideoFrames - totalVideoFrames is 0 in Firefox and Safari

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?

Browser compatibility shows that totalVideoFrames is supported on firefox and safari but for both browsers it returns 0. Chrome and edge works. The video is visually moving. For firefox mozPaintedFrames does work but is deprecated so I rather use the same object for each browser.

What browsers does this problem apply to, if applicable?

No response

What did you expect to see?

I expected the value to go up with each function call.

Did you test this? If so, how?

Tested this while running playwright tests locally on latest chrome, firefox, edge and webkit versions.

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

No response

Do you have anything more you want to share?

No response

MDN URL

https://developer.mozilla.org/en-US/docs/Web/API/VideoPlaybackQuality/totalVideoFrames

MDN metadata

Start with the MDN URL and the browser-compat-data entry for VideoPlaybackQuality.totalVideoFrames, then reproduce the reported behavior in the latest Chrome, Firefox, Edge, and WebKit versions as described. Done means the compatibility data accurately reflects confirmed browser behavior, with supporting evidence for any change.