I examined this and it appears that you can get the same effect yourself by enabling ETP strict mode, disabling telemetry and suggestions, and installing uBlock Origin in Firefox, which is a pretty common configuration for a lot of people. I suppose it's easier to just install this and have that already set up, but it's not exactly hard to do this in Firefox for the average HN reader and you most likely /already have…
I don’t know a lot about how Arch’s AUR works but this seems like something that could be made an AUR package for example with special configuration while still using “base” Firefox to put it together, rather than profiling it as a new product.