No one is forcing you to consume the DRM'd content, if it offends you.
Superficially your right - but missing the point. Why the FUCK am I forced to adopt DRM by having it attach itself to open protocol specifications that I use, then? Now my browser will just automagically switch to using it at any old websites request. I preferred the old way, where people who were happy to voluntarily submit to DRM decided to download all the invasive DRM plugins they liked and it all worked perfectly for them - THERE WAS NO NEED to literally force the vast majority of people who do not use DRM to suddenly have built in support for it, so it can be just used by any old website now without all the plugins.
The question is rhetorical by the way - we all know why it was backdoored into our open protocols. To FORCE DRM DOWN OUR THROATS WHETHER WE LIKE IT OR NOT. They were losing too many customers who had to jump through extra hoops to use their evil shit.
So superficially you would be right - but in reality DRM is being forced on us and Firefox and other browsers can try to lube it up as much as they like with their open source wrappers, like that makes any difference. The floodgates are about to open and in a few years the whole web is going to be one giant clusterfuck of DRM content. Tim Berners-Lee, how could you get it so wrong.