If Netscape had a large paid install base and still failed because a free browser became ubiquitous, what makes you think doing that now when the free browsers are already ubiquitous would work? Especially when it also has to compete with what is essentially already what you’re describing, Librewolf (or just Firefox + Arkenfox).

I haven’t gotten around to spinning it up yet, but I was just looking into this myself and was going to try out Pinchflat. If anyone has used it and has any feedback I’d love to hear it.

I was between it and Tube Archivist.