[Barrin92]

I use it a lot because I have only one monitor.

[Mirioron]

Couldn't you just open it in a new window and resize/tile your existing windows?

[kccqzy]

Websites often change their layout depending on the window size. If you simply make the window smaller, the website may switch into a different layout that makes the video even smaller. It doesn't solve the problem of showing just the video with nothing else.