This has gotten some attention, especially about a week ago, but I really hope more people will continue to try it and, if interested, support it. It is Firefox, but heavily modified to please a different audience that prefers a slightly different UI than Firefox. It has some of the appeal of Arc, Vivaldi, and the Sidebery extension.
In my view, it is very promising, and all competition in this space is good. Here it is on Github, also.
A great custom skin, and far better defaults for both privacy and speed, based on Betterfox.
The fact that a fork that simply has a better UI and default settings is gaining so much popularity shows how bad Mozilla is fumbling their product.
I do hope this puts mozilla in a position where they have to improve firefox.