> I think too many techies are, much like yourself, contributing to the problem by refusing to move away from Chrome [...]
Contrary to your assumptions, I've been quite vocal against the Chrome/Blink monoculture for a while. Unfortunately there is a legit case for it; several generations of "low-end" devices (anything older than 10 years basically), that are still quite capable and in common use, where the difference in performance between Firefox and Chromium becomes quite noticeable, especially as you try to watch video.
I don't think the problem is "techies", we have zero influence outside our own circles - see the historical rates of Linux adoption. The problem is we need the good ol' hammer of antitrust to start swinging again. We also need the regulators to be smart; if we get really unlucky, they will target iOS Safari instead. (This would be good in a healthy ecosystem, but would only serve to further entrench Google's position in the current situation.)
By the way, using a filtering/rewriting proxy has other merits, especially on said older hardware; you can rewrite the entire web page to make it more lightweight and accessible. Check out miniwebproxy[1] and medium-rare[2]. It's also quite simple to write one; you need maybe a hundred lines of Go to start getting results. I've been experimenting with integrating Readability[3][4]; and I think there's more potential to this approach.
[1]: https://humungus.tedunangst.com/r/miniwebproxy
[2]: https://humungus.tedunangst.com/r/medium-rare
[3]: https://github.com/go-shiori/go-readability
[4]: https://github.com/mozilla/readability