Oh, that is too bad. After hearing this, I decided to do a little searching around to see if I could find an open-source browser that is more active. I found Nyxt.
URL: https://nyxt.atlas.engineer/
source: https://github.com/atlas-engineer/nyxt
license: BSD-3 & Creative Commons
Also, if you are an emacs fan:
https://ag91.github.io/blog/2021/06/08/emacs-nyxt-and-engine...
From their FAQ:
https://nyxt.atlas.engineer/faq
Nyxt is web engine agnostic. We utilize a minimal API to interface to any web engine. This makes us flexible and resilient to changes in the web landscape. Currently, we support WebKit and WebEngine (Blink).
So in theory, you could switch between web engines. I don't know if you can do that on demand or not. It does seem like a cool project, so I will likely try it out.