There is a Firefox fork with patches to make it run on 10.13. I found this, but it’s very likely you can find built binaries or installer: https://github.com/v

There is a Firefox fork with patches to make it run on 10.13. I found this, but it’s very likely you can find built binaries or installer: https://github.com/vladimir-andreevich/firefox-macos-legacy https://github.com/vladimir-andreevich/firefox-macos-legacy