I tried Chromium too... doesn't work.
Firefox not working for me either, even with DRM enabled, and even after starting Firefox in safe mode to disable other addons. My Firefox is up to date. This should work, but it doesn't.
Solution: install Google Chrome. The real-deal Google Chrome. I think it is also available in your Software Manager, which is probably the best way to install it. This worked for me.
The Opera web browser may work also. Whichever works for you, be sure to keep it up to date.
Good luck!