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Doesn't work in Greasemonkey, opens as text in new window.

Hello, I use Greasemonkey with the latest Firefox Quantum 57.0.2 64 bit. I am so fed up of having to keep restoring old youtube, this has been going on now for many months. I think youtube programmers are trying to make the website deliberately frustrating and annoying for it's users. Why, why are they doing this? When I click 'install this script', it opens as text in a new tab. I've tried copying and pasting as a .js file, same thing happens when I run it. I can't get it to work.

OMG! I got it to work I installed Tampermonkey and it works! Thanks so much for this! There is still one more annoyance, now there's a blue bar at the top which loads on every page: 'We've been hard at work on the new YouTube, and it's better than ever. Try it now.' It's nowhere near as bad as what I had to keep doing but I have to keep closing it on every youtube page I open. No youtube, it isn't better than ever and I would have thought it obvious the fact that I kept restoring old youtube means that I don't want to 'try it now'. Typical, get rid of one annoyance, they make another one.

I've updated the code, the banner should be hidden automatically.

Yep, that works as well! You Legend :)