the plug-in interface is standardized
Previously, there was some hesitation to use this crap thanks to this lack of standardization. Now, thanks to this idiotic move by Mozilla this type of DRM will be used, and if you think it only apply to Netflix - or only apply to video - you haven't been paying attention.
Now that it is possible to for businesses to claim that "almost all of our potential customers support DRM", it will be used in many places. Remember the pages that show an image of text instead of just putting the text in the page? Well, get ready for the video equivalent the first time someone gets paranoid because browsers have a save-as feature. Besides, once DRM for one type of content is in place, the other industries will cry "equal access".
All of you who are "ok" with this, or are thinking only of convenience - your selfish view of the world is a big part of why this is happening. You should be fighting this, if you give a damn about having an free an open internet in the future. Unfortunately, you're probably going to mod me down and go back to cheering about how you get to watch movies in your browser, and I hope you enjoy fighting the far more difficult battles in the future, because you didn't stop this crap when it was still small.