Firefox Nightly for Developers

Download Firefox Nightly for Developers APK

org.mozilla.fenix · by Mozilla

Latest Version: 143.0a1 • Updated: Dec 04, 2025

Screenshots

About Firefox Nightly for Developers

Warning: Nightly is an unstable testing and development platform. By default, Firefox Nightly automatically sends data to Mozilla — and sometimes our partners — to help us handle problems and try ideas. Learn what is shared: www.mozilla.org/en-US/privacy/firefox/#pre-release Firefox Nightly gets updated every day and is designed to showcase the more experimental builds of Firefox. The Nightly channel allows users to experience the newest Firefox innovations in an unstable environment and provide feedback on features and performance to help determine what makes the final release. Found a bug? Report it at: bugzilla.mozilla.org/enter_bug.cgi?product=Fenix Want to know more about the permissions Firefox requests?: mzl.la/Permissions See our list of supported devices and latest minimum system requirements at: www.mozilla.org/firefox/mobile/platforms/ BILLIONAIRE FREE FOR 20+ YEARS The Firefox browser was created in 2004 by Mozilla as a faster, more private browser with more customizable features than web browsers like Internet Explorer. Today, we are still not-for-profit, still not owned by any billionaires and still working to make the internet — and the time you spend on it — better. To learn more about Mozilla, please go to www.mozilla.org . LEARN MORE - Terms of Use: www.mozilla.org/about/legal/terms/firefox/ - Privacy Notice: www.mozilla.org/privacy/firefox - Latest news: blog.mozilla.org Take a browse on the wild side. Be among the first to explore future releases.

Frequently Asked Questions

Yes. Every Firefox Nightly for Developers APK on APK.now is automatically scanned and the cryptographic signature is verified against the original publisher's certificate (Mozilla). Files that fail verification are removed before they ever reach the catalog.

Enable 'Install from unknown sources' for your browser (or the file manager you use to open the APK) under Settings → Apps → Special access. Tap the downloaded Firefox Nightly for Developers APK, confirm the prompts, and Android installs it just like any app from the Play Store.

The latest Firefox Nightly for Developers version available on APK.now is 143.0a1. We track new releases from Mozilla continuously and add them to the catalog as soon as they pass verification.

Yes — every Firefox Nightly for Developers APK and every version on APK.now is free to download. We never gate downloads behind sign-up, surveys, or paywalls.

APK.now keeps a full archive of every Firefox Nightly for Developers release, including older versions that the Play Store has already replaced. The APKs work on devices without Google Play Services (Huawei, GrapheneOS, Amazon Fire) and are signature-verified so you can be confident the file is genuine.