Then an interesting question is IF the Facebook container stemmed from principles 4 & 5 from the Mozilla Manifesto applied to the dominant social utility; is there a reason other than money that the same principles would not lead to a decision to build an add-on that gives people an option to contain Google? It's certainly not a technical limitation.

It seems natural to posit that money is the issue but is it so easy to believe that a foundation most of us trust would compromise its core values?

As mentioned elsewhere hacky add-ons cannot be the end solution, and will not be widely adopted unless incorporated as defaults.