Unfortunately, Embedded Gecko is not supported anymore... https://developer.mozi...

		enz on June 9, 2019 \| parent \| context \| favorite \| on: Opera, Brave, Vivaldi to ignore Chrome's anti-ad-b... Unfortunately, Embedded Gecko is not supported anymore... https://developer.mozilla.org/en-US/docs/Mozilla/Gecko/Embed... However, the new Servo engine will be embeddable.