multifirefox (disabled)

Install command: 
brew install --cask multifirefox

Name: MultiFirefox

Launcher utility to run multiple versions of Firefox side-by-side

https://davemartorana.com/multifirefox/

Development: Pull requests

Cask JSON API: /api/cask/multifirefox.json

Cask code: multifirefox.rb on GitHub

Current version: 2.3.3

Requirements: macOS >= 10.15

Analytics:

Installs (30 days)
multifirefox 4
Installs (90 days)
multifirefox 9
Installs (365 days)
multifirefox 101