Alternatives to Firefox Nightly

Mozilla's daily pre-release build of Firefox for trying and testing upcoming browser features. The listings below can replace it for an important use case. Each note says what changes if you switch.

Replacements

Listings that take over the same core job as Firefox Nightly.

  • Firefox Developer Edition

    A pre-release build of Firefox for web developers, with the newest developer tools and platform features.

    FreeOpen sourceWindowsmacOSLinux

    Firefox Developer Edition is a pre-release build aimed at web developers, with the newest developer tools and ARM64 builds, but features reach it later than they reach Nightly.

  • Firefox

    The main browser not built on Chromium, with tracking protection turned on by default.

    FreeOpen sourceWindowsmacOSLinuxAndroidiOS

    Firefox is the stable release of the same browser, suitable as a main browser on desktop and mobile, but new features arrive only after pre-release testing.

  • Microsoft Edge Dev / Canary

    Preview channels of Microsoft Edge for testing early features.

    FreeProprietaryWindowsmacOSLinux

    Microsoft Edge Dev / Canary preview channels test upcoming Edge features and DevTools on a proprietary Chromium base, installing separately from stable Edge instead of tracking Firefox changes.

  • Safari Technology Preview

    Apple's early-access Safari build for macOS with the latest WebKit engine and developer tools.

    FreeProprietarymacOS

    Safari Technology Preview gives early access to the latest WebKit engine and Web Inspector, updating every few weeks rather than daily, and runs only on macOS.

  • Chromium

    The open-source browser project that Chrome, Edge, Brave, Opera and Vivaldi are all built from.

    FreeOpen sourceWindowsmacOSLinux

    Chromium lets testers follow the open-source Chromium engine with Chrome for Testing builds for every channel, but official builds do not auto-update on Windows or macOS.

Similar software

Related functionality, not a direct replacement.