Mozilla Firefox Nightly

About

Firefox Nightly gives you a sneak peek at Mozilla's next generation web browser. By downloading it, you can help the team make it the best browser it can be. The website describes Nightly as an unstable testing and development platform, and notes that it updates approximately once or twice a day.

Nightly is available for macOS, along with Windows and Linux builds. The site notes that Nightly is no longer supported on macOS 10.14 and below, and recommends Firefox ESR for those systems. By default, Nightly sends data to Mozilla, and sometimes its partners, to help handle problems and try ideas. The website links to information about what is shared.

If you see something that isn't working, the website invites you to let Mozilla know, including by filing a bug. Tips for filing a bug are provided on the site.