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.

[–] CanadaPlus@futurology.today 2 points 9 months ago* (last edited 9 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.