+| geo.enabled | string | Firefox 70, Firefox ESR 6.2 | true
+| If false, the geolocation API is disabled. | Language dependent
+| intl.accept_languages | string | Firefox 70, Firefox ESR 6.2
+| If set, preferred language for web pages.
+| media.eme.enabled | string | Firefox 70, Firefox ESR 6.2 | true
+| If false, Encrypted Media Extensions are not enabled.
+| media.gmp-gmpopenh264.enabled | boolean | Firefox 68, Firefox ESR 68 | true