How to get Mouse buttons 4 / 5 (Browser back / Browser forward) working in Firefox?

I can recommend the SensibleSideButtons project. It’s easy to install, and it will fix those mouse buttons in many other programs, too.

I had the same issue.

System Information

  • macOS 10.15.5
  • Firefox 83.0
  • Logitech MX Master 2S Wireless Mouse

Steps to Reproduce

  • Open Firefox.
  • Navigate to page.
  • Click back, click forward.


  • Install Logitech Options for macOS.
  • Open application.
  • Allow application to control your computer: System Preferences > Security & Privacy > Accessibility > Check Logi Options and Logi Options Daemon