Firefox Nightly for Developers

54.7K reviews
Content rating
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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:

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:

Want to know more about the permissions Firefox requests?:

See our list of supported devices and latest minimum system requirements at:

Mozilla marketing: In order to understand the performance of certain Mozilla marketing campaigns, Firefox sends data, including a Google advertising ID, IP address, timestamp, country, language/locale, operating system, app version, to our third party vendor. Learn more by reading our Privacy Notice here:

Take a browse on the wild side. Be among the first to explore future releases.
Updated on
May 20, 2024

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, App activity and 2 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

51.2K reviews
A Google user
August 13, 2019
it works pretty well. the added security/less tracking than other browsers is a huge plus. the only problem with the browser is how swiping up from the bottom of the screen is how you set bookmarks, share pages, access settings/report site issues etc. galaxy phones have their home button/back button swipe up from the bottom of the screen the same way. because of this, the bookmarks button and the "report site issue" button get hit accidentally countless times. it's super frustrating.
8 people found this review helpful
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A Google user
May 20, 2019
I used Fenix daily for almost the entirety of its lifetime and it was great. There were a few issues and some crashes as expected, but I'm glad to report that the experience was mostly awesome. I'm having an odd issue with this build though. The app crashed after I navigated to some URL (can't remember what it was, I'll try to find it). After this initial crash, the app crashes on load every time. I can provide more info upon request.
11 people found this review helpful
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A Google user
June 28, 2019
This browser is noticeably faster than the standard Firefox mobile app by a large margin. Far less time is spent sitting idle waiting for no apparent reason, and rendering accuracy is much improved. Since this is just a preview, though, the feature set is quite barebones: no addons, very few settings, can't disable cookies, no reader mode, no language switching, no local login management, etc. While I won't be using this as my daily driver, color me impressed! I can't wait to see it grow.
15 people found this review helpful
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