why won't videos play on youtube on my Macbook using Sierra?

[iMore Question]

For some reason videos on youtube don't play all of a sudden. i have a Macbook Air, using OS Sierra and Browser Firefox. Sorry, i have a Cognitive Disorder and am not tech savvy anymore!

 

[Just_Me_D]

If you're trying to watch the videos via a web browser, check the browser settings to make sure you haven't enabled something that could prevent the videos from displaying.