Firefox forks might be a reasonable short-term solution to the current era of Mozilla paper cuts, but the crisis is ultimately driven by economics.

Browser dev and maintenance is expensive and that pressure is pushing Mozilla towards the same underhanded, advertiser-driven strategies embraced by google et al.

At best firefox-forks are a less well funded version of what Mozilla used (at least publicly) aim for.

What I would really like to see in the browser space is an actual strong vision that prioritizes the open web, and community building - one that suggests alternatives to ad-tech (e.g. browser support for micropayments or subscriptions or view-proportional payments or the dozens of other models proposed over the decades)
@Meyerweb servo may be part of the solution - I do think that making it easier to build and maintain alternate browsers is likely needed to approach some kind of better future.