Firefox for Ubuntu (which comes ready installed) seems to be missing the DRM plugin, which means many streaming websites no longer work on this platform. I'm advised to install Adobe Flash 28 instead which is available for Ubuntu. But most streaming websites now use an HTML5 player. Of the few streaming websites that still work with Flash player the quality is appalling in Ubuntu, far worse than you'd normally expect with SD streaming. None of these problems occur with Windows. So, please, how do I go about installing the DRM plugin for Ubuntu.