I think you meant Digital Restrictions Management. It's a sad day for Mozilla, the w3c, the web as a whole, and open culture.
So just to be clear, Mozilla supplies a sandbox that and downloads a decoder from adobe (I think). This is a LOT safer than flash, java plugins or silverlight.
DRM sucks no doubt, but at least it's now isolated... In a sandbox that is open source, not a sandbox created by adobe.
Long term, I think DRM will die on it's own, like it did in the music industry. But I don't see Mozilla having the capital to change the market, not when Google, Apple and Microsoft all embrace DRM. Honestly I would rather see Mozilla around to fight another day, because the I don't think the war on DRM is over.
That said, at least this is better, safer and less intrusive than current alternatives (flash, silverlight and various other plugins).