Ever since my Firefox updated my YouTube videos are all playing low quality be default.

I don't know why this has happened but ever since my Firefox upgraded all YouTube videos have been playing super low quality by default. When I first installed Firefox months ago this wasn't a problem. Everything played HD by default. But every time Firefox upgrades itself the videos go down in quality. And especially since the OS upgrade everything is playing super low quality by default. How do I get them to just play HD by default again?

Thanks so much for your time and help!

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