Add/update Firefox data for Navigator API (#6830)
Add/update Firefox data for Navigator API (#6830)

This commit updates the Firefox data for the Navigator API using the
mdn-bcd-collector project, aided with a little manual testing, to
achieve more real data for the Navigator API.

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