Momiji is a community backport of Firefox for 64-bit Intel Macs running OS X 10.7 Lion through macOS 10.14 Mojave, where current browsers have long since stopped. Stable follows Firefox ESR 140 (next moving to ESR 153) and Rolling tracks Firefox’s regular releases, each as zip builds for 10.7–10.11 and 10.12–10.14. It’s open source under MPL 2.0, unaffiliated with Mozilla, and Netflix and Spotify won’t play by default without Widevine.