Pale Moon forum

When I first started using Palemoon about a couple of months ago, I could play videos for Semantica-Portuguese.com. Now I cannot play the videos for that site. what do I have to do to be able to play videos once again? What is happening at the beginning of the video before hitting play, I see a picture of what the video maybe about. Once I hit play, screen goes black, play sign returns back to the sideways triangle. I hit the arrow again and it runs with no video playing. All I see is a black screen.

1. I am using Window's Vista
2. 32-bit
3. semantica-portuguese says it uses html-5.

4. I just want to play the videos so I can keep on learning.

Try disabling MSE and see if that allows them to play.