I must be missing something. I read the article and clicked the attached link to Mozilla's blog, and nothing seems radically to change for users other than a move sideways. Though I'm a little disappointed that there isn't a move forward, it certainly doesn't feel like a step backwards. Even Mozilla writes, "At Mozilla we think this new implementation contains the same deep flaws as the old system. " (emphasis mine)
Right now if you want to lock something down, like watching Netflix on your browser, you install Silverlight. In the future, Silverlight is replaced and Netflix uses XYZ technology but maybe with DRM-in-HTML or whatever. And as a user, it doesn't matter because most people I know today use a tablet with the native app, a streaming device such as the Roku player, or a SmartTV.
If I want to watch Netflix I use a different browser. I don't need to use the same browser for everything online, and I especially don't enable Silverlight in my primary browser.
Right now if you want to lock something down, like watching Netflix on your browser, you install Silverlight. In the future, Silverlight is replaced and Netflix uses XYZ technology but maybe with DRM-in-HTML or whatever. And as a user, it doesn't matter because most people I know today use a tablet with the native app, a streaming device such as the Roku player, or a SmartTV.