New Release: Tor Browser 15.0.4

[system]

by ma1 | January 13, 2026

Tor Browser 15.0.4 is now available from the Tor Browser download page and also from our distribution directory.

This version includes important security updates to Firefox.

Send us your feedback

If you find a bug or have a suggestion for how we could improve this release, please let us know.

Full changelog

The full changelog since Tor Browser 15.0.3 is:

• All Platforms
  • Bug tor-browser#44418: Update built-in obfs4 bridges
  • Bug tor-browser#44433: Weird §:domain.com label in the Blocked Objects window
  • Bug tor-browser#44470: Rebase Tor Browser stable onto 140.7.0esr
  • Bug tor-browser#44474: Backport Security Fixes from Firefox 147
  • Bug tor-browser#44482: (H1) Script execution in Safest mode via data URI navigation
• Windows + macOS + Linux
  • Updated Firefox to 140.7.0esr
• Android
  • Updated GeckoView to 140.7.0esr
  • Bug tor-browser-build#41681: Keep public suffixes up-to-date on 140esr-based Tor Browser for Android
• Build System
  • All Platforms
    • Bug tor-browser-build#41654: Make relprep.py update Moat settings
    • Bug tor-browser-build#41682: relprep.py should fail when a GitHub release is not found
    • Bug rbm#40090: Make the cleanup faster
    • Bug rbm#40095: cached checksums should not be used for input files when refresh_input is enabled
  • Android
    • Bug tor-browser-build#41679: Android tor-expert-bundle archives missing version in filename

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This is a companion discussion topic for the original entry at https://blog.torproject.org/new-release-tor-browser-1504

[ctorc]

Update fails on 15.0.3 (linux)

From the “Update available” popup I get the message “Tor Browser couldn’t update automatically. Download the new version…”

From the Help → About menu I get the message “Update failed” right after the download starts, it stops suddenly at 0/7.5mb.

[ebanam]

@ctorc, please try again now.

[ctorc]

Now it works, thanks.

[muzammil2123]

Please try again now