Most video playback problems are attributed to slow internet connection. You can choose a lower quality in the videos by clicking the “HD” button at the bottom of the player and choosing the 180p setting.
Please be aware, there is a known issue with playback in current Firefox with MP4 files. Videos may start to play and then freeze or drop out entirely. The video’s audio may also be out of synchronization with the film.
We recommended Google Chrome for both printing and video playback.
For a list of browser support visit Recommended System Requirements.