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Firefox Nightly for Developers v161.0a1

Productivity · Mozilla · Updated Oct 25, 2026

Firefox Nightly for Developers is Mozilla's daily experimental Android browser. It lets you test upcoming Firefox features, new web technologies and experimental APIs before they reach the stable release, with a fresh build every day and its own profile, so it runs alongside regular Firefox.

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Version

161.0a1

File Size

246 MB

Developer

Mozilla

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Frequently Asked Questions

Common inquiries regarding Firefox Nightly for Developers installation & verification

What is Firefox Nightly for Developers?

It is Mozilla's experimental Android browser channel for testing upcoming web technologies, experimental APIs and daily code updates before they reach the stable Firefox release.

Can I install Firefox Nightly alongside the regular Firefox browser?

Yes. It installs as an independent package with its own icon and profile data, so it runs smoothly alongside the stable Firefox app on the same device.

How often does Firefox Nightly receive updates?

Every day. Nightly builds pull the latest merged code from Mozilla's central repositories, so you get new features and fixes daily.

Is Firefox Nightly safe for daily primary web browsing?

It works, but it is an unstable testing platform. Bleeding-edge code can occasionally crash or behave unexpectedly, so it is better suited to testing than to mission-critical daily browsing.

Does Firefox Nightly support remote debugging from a desktop computer?

Yes. Enable USB debugging in the app settings and you can inspect elements, analyse network traffic and debug scripts using desktop developer tools.

Does Firefox Nightly send data to Mozilla?

By default, Nightly automatically sends data to Mozilla, and sometimes its partners, to help handle problems and try ideas. Mozilla's pre-release privacy notice explains what is shared.