brew install --cask multifirefox
Name: MultiFirefox
Launcher utility to run multiple versions of Firefox side-by-side
https://davemartorana.com/multifirefox/
Cask JSON API: /api/cask/multifirefox.json
/api/cask/multifirefox.json
Cask code: multifirefox.rb on GitHub
multifirefox.rb
Current version: 2.3.3
Current version requires: macOS >= 10.11
Analytics:
multifirefox