Have you checked the html5 video player: https://www.youtube.com/html5 Lots of YouTube videos will play using HTML5. so make sure your browser is using it by default.
Or follow this one:...

Are you saying that you meet the problem that YouTube not working on Firefox again? Maybe you can turn off AdBlock if you have installed it on your browser. And how about the HTML5 player and the...

I'm glad that you get help here.:chuckle:

Get a new tab by clicking a link, you can:
1. press "Ctrl", then click the link, you can get it in a new tab;
2. right-click the link, then choose "Open link in new tab";
Or you can go here to set...