Add Firefox versions for MessagePort API (#7890)
Add Firefox versions for MessagePort API (#7890)

This PR adds real values for Firefox and Firefox Android for the `MessagePort` API, based upon results from the [mdn-bcd-collector](https://mdn-bcd-collector.appspot.com) project (v1.1.6).  Results are manually confirmed for accuracy.

Tests Used: https://mdn-bcd-collector.appspot.com/tests/api/MessagePort
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data