Is anyone else' youtube not working properly?

I'm having trouble loading pages. I'll click on a video or something and a window will pop up saying opening watch: what do you want firefox to do with this? I'll have two options, to either open using a bunch of programs or save it. If I close it and click on the video again, it either won't load, or will load so unbearably slow that it takes 10 minutes to load a single video. If you're not having this problem, or if you are, I'm wondering if I could get some advice.