I work for Mozilla, but speak for myself. If you think it was about control, then you don't know how Mozilla works. We fight larger players with one arm tied behind our back because of our commitment to making things open and interoperable. We do it gladly, because we know that sometimes our reference implementation won't be the best implementation, and even if we fail, we want the tech to live on. Every day I have or overhear a discussion about making certain what we build doesn't privilege our own solutions over others. Are we perfect at this? No. Sometimes security of our users trumps a completely level playing field. But every time we have to slightly close a technology, know that it's done extremely begrudgingly.