Why should I bother watching some random video just because game does not work?
Most games work properly, I just don't see a point in commenting about that. Whether devs make game workable for me is not the point of my comments. Also, I want to point out that anyone yet to provide me with any suggestions regarding my configuration in case if it is one that causes such errors. On the other side, there is this, which explains most of the games that don't work for me and unrelated to my setup. I still post about it not working so devs are aware.
It sounds like a problem with running HTML on your Firefox browser. Have you tried running the game on Chrome Edge or any other browser?
Also, what kind of computer device do you use because this is very weird, look at all these people playing the game no problem hell I can even run the browser version of the game on my Android phone no problem either so it must be some problem with your set up not with these game
Have you tried the solution in this video?