https://press.opera.com/2024/03/27/add-streamer-reactions-to-video-with-reaktinator-from-opera-gx/
Add streamer reactions to video with “REAKTINATOR” from Opera GX - Opera Newsroom
Mar 28, 2024 - New Opera GX feature, the “Reaktinator,” allows users to add their own videos to create different reaction variants while watching YouTube.
opera gxaddstreamerreactionsvideo