Found it again after a bit of googling. It's called Browsh. Haven't played with it yet (will report back when I do) but from the demo on that github page it seems to work pretty well.

UPDATE: I've tried it out and hooooly craaaaaap this is good. If I didn't know this was running in a terminal I would never have guessed. I would've just assumed it was a novelty browser meant to evoke that style. Smooth scrolling works astonishingly well as does video playback.

[–] CanadaPlus 3 points 10 months ago* (last edited 10 months ago)

Lol, I'm already up and running. It's pretty good, and I can actually use my mouse with it in bash. Protip, it seems very important to use the right window size. It's good enough to do a lot of normal browsing, but openstreetmap understandably had broken controls. The only local issue is that I can't see what I'm entering into the URL bar.

It's also designed to run distributed, so you can use shitty bandwidth between a rendering machine and the display machine. I should try fitting it into a radio channel or phone connection or something, haha. I also wonder if it could be adapted to work with Tor Browser.