What's new in Firefox Nightly for Developers 1.3.1

Thank you for testing Firefox Preview. Now you can send a tab or a Collection of tabs from > your phone to your other Firefox connected devices! This update also includes enhancements to private browsing and dark mode, along with usability and stability bug fixes.

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About Firefox Nightly for Developers 1.3.1

Firefox Nightly for Developers 1.3.1 Play Store screenshots (4)

Screenshots from version 159.0a1

Download Firefox Nightly for Developers 1.3.1

This release comes in several variants (we currently have 4). Consult our handy FAQ to see which download is right for you.

Variant
Arch
Version
DPI
1.3.1 APK
12341949
August 23, 2019
armeabi-v7a
Android 5.0+
nodpi
1.3.1 APK
12341950
August 23, 2019
arm64-v8a
Android 5.0+
nodpi
1.3.1 APK
12341951
August 23, 2019
x86
Android 5.0+
nodpi
1.3.1 APK
12341952
August 24, 2019
x86_64
Android 5.0+
nodpi
All Releases
Firefox Nightly for Developers 159.0a1

Version:159.0a1

Uploaded:September 26, 2026 at 7:34PM UTC

File size:67.85 MB

Downloads:97

Firefox Nightly for Developers 158.0a1

Version:158.0a1

Uploaded:September 24, 2026 at 2:11PM UTC

File size:67.07 MB

Downloads:413

Firefox Nightly for Developers 157.0a1

Version:157.0a1

Uploaded:September 10, 2026 at 4:40AM UTC

File size:48.14 MB

Downloads:451

Firefox Nightly for Developers 156.0a1

Version:156.0a1

Uploaded:August 28, 2026 at 7:42PM UTC

File size:47.84 MB

Downloads:392

Firefox Nightly for Developers 155.0a1

Version:155.0a1

Uploaded:August 13, 2026 at 1:25PM UTC

File size:48.15 MB

Downloads:892

Version:154.0a1

Uploaded:July 20, 2026 at 5:02PM UTC

File size:66.41 MB

Downloads:1,552

Version:153.0a1

Uploaded:June 15, 2026 at 2:12PM UTC

File size:65.26 MB

Downloads:1,480

Version:152.0a1

Uploaded:May 18, 2026 at 2:18PM UTC

File size:62.75 MB

Downloads:1,372

Version:151.0a1

Uploaded:April 20, 2026 at 1:22PM UTC

File size:59.06 MB

Downloads:1,602

Version:150.0a1

Uploaded:March 23, 2026 at 11:36AM UTC

File size:58.14 MB

Downloads:1,415

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