Add Firefox versions for api.PerformanceObserver.worker_support (#10860)
Add Firefox versions for api.PerformanceObserver.worker_support (#10860)

This PR adds real values for Firefox and Firefox Android for the `worker_support` member of the `PerformanceObserver` API, based upon results from the [mdn-bcd-collector](https://mdn-bcd-collector.appspot.com) project (v3.1.4).

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