https://www.theverge.com/2018/7/25/17611444/how-to-speed-up-youtube-microsoft-edge-safari-firefox

Google launched a new YouTube design nearly a year ago, but if you’ve been using Edge, Safari, or Firefox then you’ve probably wondered why YouTube is loading so slowly. Mozilla program manager Chris Peterson has highlighted the issue this week, and it’s not your alternative browser that’s to blame. Google’s redesign still relies on a deprecated shadow API that’s only implemented in Chrome, making other browsers render YouTube five times slower.

It’s the latest case of Google building and tuning its web services so they work better or only work in the company’s Chrome browser. Google Meet, Allo, YouTube TV, Google Earth, and YouTube Studio Beta have all blocked Microsoft Edge in the past, and Google Meet, Google Earth, and YouTube TV have all also been blocked if you use Firefox. Google even blocked its Google Maps service on Windows Phone years ago in a passive-aggressive move that it eventually reversed. It’s an ongoing problem that means Chrome is slowly turning into the next Internet Explorer 6.