R.I.P.
Back in early 2020, The polymer version of YouTube was broken when you have Firefox 52-62 user agent applied. But then in early-April 2022, The colors, buttons, and the homepage layouts are screwed up. But then in late-April 2022, All the pages were off-centered. And then lastly in late-May 2023, The entire layout is now completely broken and you can't see videos!