Right, you don't need extensions, because you don't need customization, because what you need is what we the corp say you need.
I think Web as it exists is a failed branch of evolution.
A networked (solved) hypertext (solved) document (solved) system - yes. A networked hypertext system with one or two unbelievably complex clients, where only enormous corps have enough resources to change something, - no. One can add steps - E2E encryption, dynamic services, scripts, all not requiring a monolithic piece of nonsense.
BTW, those hating Flash, I hope, do realize that its proper, paradigm-abiding replacement would be a FOSS plugin with similar goal, not what we have.