This release updates Firefox to 115.4.0esr, including bug fixes, stability improvements and important security updates. We also backported the Android-specific security updates from Firefox 119.

The full changelog since Tor Browser 13.0a6 is:

• All Platforms
  • Updated OpenSSL to 3.0.12
  • Updated NoScript to 11.4.28
  • Bug tor-browser#42191: Backport security fixes (Android & wontfix) from Firefox 119 to 115.4 - based Tor Browser
  • Bug tor-browser#42204: Drop unused aboutTor.dtd
  • Bug tor-browser-build#40975: libstdc++.so.6 is included twice in tor-browser
• Windows + macOS + Linux
  • Updated Firefox to 115.4.0esr
  • Bug tor-browser#41341: Fix style and position of "Always Prioritize Onions" wingpanel
  • Bug tor-browser#42108: Tor Circuit button not shown if TLS handshake fails
  • Bug tor-browser#42182: Default Search Engine Does Not Persist Through Shift to New Identity
  • Bug tor-browser#42184: Setting "Homepage and new windows" ignores "Blank Page" value
• Windows + macOS
  • Bug tor-browser#42154: Empty the clipboard on browser shutdown only if content comes from private browsing windows
• Android
  • Updated GeckoView to 115.4.0esr
  • Bug tor-browser#42201: Make the script sign all the channels for local builds
  • Bug tor-browser#42222: Fix TorDomainIsolator initialization on Android
• Build System
  • All Platforms
    • Update Go to 1.21.3
    • Bug tor-browser-build#40852: Reproducible build of the the lox client library to wasm
    • Bug tor-browser-build#40934: Remove $bundle_locales from signing scripts now that we're on ALL for everything
    • Bug tor-browser-build#40976: Update download-unsigned-sha256sums-gpg-signatures-from-people-tpo to fetch from tb-build-02 and tb-build-03
    • Bug tor-browser-build#40982: Fix logging in tools/signing/do-all-signing
    • Bug tor-browser-build#40983: Bump the various branches to 13.5 on main
    • Bug tor-browser-build#40989: Add .nobackup files to reproducible and disposable directores
    • Bug rbm#40062: Copy input directories to containers recursively
  • Windows
    • Bug tor-browser-build#40984: The PDBs for .exe are not included
  • macOS
    • Bug tor-browser-build#29815: Sign our macOS bundles on Linux
  • Linux
    • Bug tor-browser-build#40979: Add redirects from old Linux bundle filename to the new one