What's new in Firefox Beta for Testers 139.0b9

From version 87.0.0-beta.2:

Thank you for testing Firefox Beta! We are excited to introduce a major upgrade and a brand new design, and as always we count on your feedback.

Key highlights:
-Bottom nav bar for easier access with option to customize
-Dark & light themes
-Collections to organize your tabs
-Improved support for Progressive Web Apps

More details at support.mozilla.org/kb/firefox-preview-upgrade-faqs

Scroll to available downloads
A more recent upload may be available below!

About Firefox Beta for Testers 139.0b9

Download Firefox Beta for Testers 139.0b9

This release may come in several variants. Consult our handy FAQ to see which download is right for you.

Variant
Arch
Version
DPI
139.0b9 BUNDLE 11 S
2016091247
May 17, 2025
universal
Android 5.0+
120-640dpi
All Releases
Firefox Beta for Testers 140.0b9

Version:140.0b9

Uploaded:June 14, 2025 at 6:47PM UTC

File size:53.15 MB

Downloads:27

Firefox Beta for Testers 140.0b8

Version:140.0b8

Uploaded:June 12, 2025 at 3:36PM UTC

File size:53.15 MB

Downloads:19

Firefox Beta for Testers 140.0b7

Version:140.0b7

Uploaded:June 10, 2025 at 3:44PM UTC

File size:53.14 MB

Downloads:28

Firefox Beta for Testers 140.0b6

Version:140.0b6

Uploaded:June 7, 2025 at 3:21PM UTC

File size:53.13 MB

Downloads:45

Firefox Beta for Testers 140.0b5

Version:140.0b5

Uploaded:June 5, 2025 at 3:07PM UTC

File size:53.1 MB

Downloads:16

Firefox Beta for Testers 140.0b4

Version:140.0b4

Uploaded:June 3, 2025 at 3:20PM UTC

File size:53.04 MB

Downloads:11

Firefox Beta for Testers 140.0b3

Version:140.0b3

Uploaded:May 31, 2025 at 4:10PM UTC

File size:53.05 MB

Downloads:46

Firefox Beta for Testers 140.0b2

Version:140.0b2

Uploaded:May 29, 2025 at 5:07PM UTC

File size:53.02 MB

Downloads:43

Firefox Beta for Testers 139.0b10

Version:139.0b10

Uploaded:May 18, 2025 at 11:10PM UTC

File size:52.58 MB

Downloads:63

Firefox Beta for Testers 139.0b9

Version:139.0b9

Uploaded:May 17, 2025 at 4:22PM UTC

File size:52.57 MB

Downloads:30

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