The oldest versions of supported browsers:

IE / Edge 11

Firefox 50

Chrome 49

Safari 10

Opera 42

iOS Safari 9.3

Android Browser 4.4

Chrome for Android 55

More information about supported versions:

Update your browser to the newest version for optimal performance.

If you want to increase the speed of the video playback, make sure your browser supports mp4.


To enable faster playback in OC Ubuntu you can use following packages:  

sudo aptitude install ubuntu-restricted-extras

sudo aptitude install vlc vlc-plugins-pulse