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Mozilla and the burning need for clients for power users
(www.theregister.com)
A place to discuss the news and latest developments on the open-source browser Firefox
What you're talking about is called "feature creep" and is a surefire road to poor quality.
I, for example, don't use any of the extensions you mentioned. And I checked two at random and both had less than 10k users, so they're by no means "must have". If they had to include all functionality that every "power user who does not appreciate having to frequently add new extensions" ever wanted, they might as well just rename it FireDinosaur or something. It will be both extremely heavy, and quickly extinct.
This browser needs a modest amount of feature creep just to reverse the past decade of feature retreat. I was mostly restricting the suggestions there to features that seem straightforward enough that they'd not lead to any cost to people who don't use them. It's by no means meant to be a comprehensive list. If you want one that would instead be very popular, how about this: https://connect.mozilla.org/t5/ideas/customizable-hotkeys/idi-p/4979