Videos don´t play

Open Dragon
Go to Facebook
Go to view a video someone has posted …

Video does not play. If I double-click ON the still image, it opens a page that shows a black screen with the < and > buttons, but shows running time as 0:00. If I RIGHT-CLICK the image, and choose “show video in new tab”, it open a new Dragon tab and allows me to view the video. However, the vid is in a small player window that I cannot re-size. I have changed the settings to ALLOW for all video formats, but didn´t change anything.

Am I doing something wrong? Or are there settings I’m missing?