Why would I want to mess with using a web browser for video in my living room, probably getting hassled over its (lack of) digital restrictions management lockdown, signing into a Google account with all of the surveillance pwnage that implies, ads (including ads for senile political ragebait) plastered all over my experience, while becoming dependent on a UI that can change at any time, likely to demand money? Youtu…
No need for all that. Just use yt-dlp (https://github.com/yt-dlp/yt-dlp) to download them as video files, and then just play the video files as you would any other video file.
Just tested yt-dlp on s1e1 to verify it worked, and it worked perfectly to download the video.