I find it moderately amusing that it seems like this ships with Chromium instead of Firefox, and doesn't note this anywhere in the manual. The manual just says "Browser" but like, really. I also find that this is definitely throwing someone off the deep end (Hyprland + neovim are not that difficult to learn, but not exactly intuitive), but I guess that's what Omakub is for (to not throw people off the deep end but still be on Linux instead of macOS).
Chromium choice is easy to explain due to PWA-shortcuts integration. That's less clunky than shipping Firefox with an extension or adding an external GUI PWA-manager.