Is it really the best solution to create a fork?
Why not invest in people to directly work on Firefox?
The author even mentions a few paragraphs before that sentence that maintaining a browser is hard:
> The problem here is that making a capable browser is actually incredibly hard, as the browser has become a hugely capable platform all of its own. Undertaking the mammoth task of building a browser from scratch is not something a lot of people are interested in [...]
And who guarantees that the fork will further exist without weird funding?
EDIT: sorry, after reading my comment again, I think it sounds a bit snarky. English is not my native language, and I don't know how to phrase these questions better, so they don't sound that way.