Firefox Browser (Nightly for Developers)

40.1K reviews
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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:

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Updated on
May 19, 2022

Data safety

Developers can show information here about how their app collects and uses your data. Learn more about data safety
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Ratings and reviews

40.1K reviews
carrick water
March 6, 2022
The one browser to rule them all. I've used a lot of browsers on both Android and iOS and honestly Firefox nightly tops them all. Allows you to install any extension in the Firefox store, allows to disable tracking, allows you to stop auto playing videos, allows you to view tabs as grids, man I can go on and on. Thank you Firefox for this wonderful product.
89 people found this review helpful
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Red Fox
March 19, 2022
Won't let me download straight to external storage. l've tried every method listed online, none work. I'm sick of getting "download failed" because I don't have room on my phone, but most of the time, I don't get any prompt to use an external downloader, even though I turned on the option in settings. This is a basic feature available in nearly every other browser out there, yet Moz doesn't seem to care.
36 people found this review helpful
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April 1, 2022
I work for a company as a certified ethical hacker...and I use Nightly all the time. Although I've had it crash occasionally,.those incidents were most likely due to my excessive background processes...but I thought it might be worth mentioning. This browser is a game changer. I've got it on my work desktop, laptops, and phone. Yay Mozilla, you guys are awesome!
80 people found this review helpful
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