A year or two ago my girlfriend needed me to download some youtube video's for her, she uses Chrome so I downloaded an extension an no problem. A few months ago same request, as she told me the download plugin wasn't working. I searched for a new one and... absolutely nothing, they were all completely gone. Went back to my PC with Firefox, and no problem. Found a bunch of extensions, tried one out, and downloaded what she needed without any problems.
So does this have something to do with the DRM mentioned in the article?