On an unrelated note, I made the same thing (barebones), but for Linux and theoretically also Windows: https://github.com/phil294/vimium-everywhere
I would also like to note that the Shortcat dev plans on adding licensing. Homerow has licensing, but there's no blocks on features. So they are both "free" in the same way.
Vimium radically improved my entire web browsing experience. I can't live without it anymore.
https://addons.mozilla.org/en-US/firefox/addon/vimium-ff/
https://chrome.google.com/webstore/detail/vimium/dbepggeogba...
Also vimium will always be faster than vimac due to how slow the accessibility API is.
I would recommend using both for now.
Awesome project by the way. This will save my wrists from a lot of pain.
Vimac had major performance issues previously when traversing the UI Element tree of Electron/Webkit apps.