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Firefox Nightly for Developers

4.3
61.2K reviews
1M+
Downloads
Content rating
USK: All ages
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About this app

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: https://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: https://bugzilla.mozilla.org/enter_bug.cgi?product=Fenix

Want to know more about the permissions Firefox requests?: https://mzl.la/Permissions

See our list of supported devices and latest minimum system requirements at: https://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 https://www.mozilla.org.

LEARN MORE
- Terms of Use: https://www.mozilla.org/about/legal/terms/firefox/
- Privacy Notice: https://www.mozilla.org/privacy/firefox
- Latest news: https://blog.mozilla.org

Take a browse on the wild side. Be among the first to explore future releases.
Updated on
Jul 2, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Location, Personal info and 3 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

4.3
56.8K reviews
Jordan Anderson
June 21, 2025
I'm not entirely sure what happened with the design of the browser since the last update I had installed, but moving all the settings to a full-screen pop-up was not the right move. I used the quick-access navigation buttons often, and the small desktop-like pop-up for settings and extensions and the like from the corner were great. This feels like Mozilla are regressing in design. I chose Firefox because it's simple, customizable, and respects me as a consumer. I now question that choice.
2 people found this review helpful
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Abby S
June 4, 2025
It's a good app and I appreciate being able to use extensions on it. I've been having an issue lately where the app crashes (like, completely closes) whenever I hit the back button on my phone. The in-browser back button works, but I've never had to use it before and it's incredibly annoying to have to restart the app every time I accidentally hit the back button I've always used.
2 people found this review helpful
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A Google user
January 31, 2020
The preview has come a long way since I last tried it. Faster, more modern and now with proper account sync, sendind tabs to other devices and better bookmarks. I like it. Though I really miss the keyword capability for bookmarks, which I usually rely on a lot :-( Still... Totally recommended as a primary browser on Android. 4.5/5 stars. EDIT: Somehow there are display errors on news websites. And I really miss keywords and tags to quickly access bookmarks. Less useful for me >> 3/5
4 people found this review helpful
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