The overall idea is very good. Conspiracy theories are a real threat and they are spreading over the internet faster than ever. And Youtube promotes them, it's just crazy.
One thing about this addon: It slows the Youtube Experience down a lot. Everything is laggy with this plugin installed. I currently have it disabled. When this gets fixed, I will enable it again.
Thanks Mozilla!

This is a great idea, but you shouldn't have to click on a video before reporting it. If I get recommended a regrettable video, I'm not generally going to click on it (or perhaps that's the point, but would I even know it to bre regrettable at that point?)

Pretty good.