Hi everyone,Tor Browser 15.0a4 has now been published for all platforms. For details please see our blog post:
- https://blog.torproject.org/new-alpha-release-tor-browser-150a4/
This is a release candidate build for Tor Browser 15.0, so it is possible your various packaging/deployment scripts may need updating.
Changelog:
Tor Browser 15.0a4 - October 16 2025
* All Platforms
* Updated NoScript to 13.2.1
* Updated OpenSSL to 3.5.4
* Bug 19741: Opensearch (contextual search) does not obey FPI [tor-browser]
* Bug 43850: Modify the Contrast Control settings for RFP [tor-browser]
* Bug 43869: Hide pens with RFP [tor-browser]
* Bug 44068: Handle migration from meek-azure to meek built-in bridge type
[tor-browser]
* Bug 44234: No images in PDF [tor-browser]
* Bug 44240: Typo on dom.security.https_first_add_exception_on_failure
[tor-browser]
* Bug 44242: Hand over Security Level's WebAssembly controls to NoScript
[tor-browser]
* Bug 44250: Rebase Tor Browser Alpha onto 140.4esr [tor-browser]
* Bug 41574: Update Snowflake builtin bridge lines [tor-browser-build]
* Windows + macOS + Linux
* Updated Firefox to 140.4.0esr
* Bug 43900: Open newtab rather than firefoxview when unloading the last tab
[tor-browser]
* Bug 44101: Toolbar connection status is not visible when using vertical
tabs [tor-browser]
* Bug 44107: Switch tab search action is missing an icon [tor-browser]
* Bug 44108: Fix the new history sidebar [tor-browser]
* Bug 44123: Do not trim protocol off of URLs ever [tor-browser]
* Bug 44153: Test search engines [tor-browser]
* Bug 44159: Change or hide the sidebar settings description [tor-browser]
* Bug 44177: Remove more urlbar actions [tor-browser]
* Bug 44178: Search preservation does not work with duckduckgo in safest
security level [tor-browser]
* Bug 44184: Duckduckgo Onion Lite search does not work properly in safest
when added as a search engine [tor-browser]
* Bug 44187: TLS session tickets leak Private Browsing mode [tor-browser]
* Bug 44192: Hovering unloaded tab causes console error [tor-browser]
* Bug 44213: Reduce linkability concerns of the "Search with" contextual
search action [tor-browser]
* Bug 44214: Update letterboxing to reflect changes in ESR 140 [tor-browser]
* Bug 44215: Hide Firefox home settings in about:preferences [tor-browser]
* Bug 44221: Backport MozBug 1984333 Bump Spoofed Processor Count
[tor-browser]
* Bug 44239: DDG HTML page and search results displayed incorrectly with
Safest security setting [tor-browser]
* Bug 44262: Disable adding search engines from HTML forms [tor-browser]
* Linux
* Bug 44227: Some CJK characters cannot be rendered by Tor which uses the
Noto font family [tor-browser]
* Bug 41586: Replace Noto CJK with Jigmo on Linux [tor-browser-build]
* Android
* Updated GeckoView to 140.4.0esr
* Bug 43401: Replace the constructor of Locale with a builder [tor-browser]
* Bug 43643: Clean out unused tor connect strings [tor-browser]
* Bug 43650: Survey banner behaves like a dialog on Android, rather than a
card [tor-browser]
* Bug 43676: Preemptively disable unified trust panel by default so we are
tracking for next ESR [tor-browser]
* Bug 44031: Implement YEC 2025 Takeover for Android Stable [tor-browser]
* Bug 44218: Tor Browser Alpha for Android (15.0a2) doesn't work on Huawei
devices P20 and P30 [tor-browser]
* Bug 44237: Revoke access to all advertising ids available in Android
[tor-browser]
* Build System
* All Platforms
* Bug 41568: Update instructions for manually building 7zip
[tor-browser-build]
* Bug 41576: Build expert bundles outside containers [tor-browser-build]
* Bug 41579: Add zip to the list of Tor Browser Build dependencies
[tor-browser-build]
* Bug 41588: Restore legacy channel support in
projects/release/update_responses_config.yml [tor-browser-build]
* Bug 41589: Backport tor-browser-build-browser#41270: Add updater
rewriterules to make 13.5.7 a watershed [tor-browser-build]
* Windows + macOS + Linux
* Bug 41373: Remove `_ALL` from mar filenames [tor-browser-build]
* Bug 44131: Generate torrc-defaults and put it in objdir post-build
[tor-browser]
* Windows + Linux + Android
* Updated Go to 1.24.9
* Windows
* Bug 44167: Move the nsis-uninstall.patch to tor-browser repository
[tor-browser]
* macOS
* Bug 41571: Work-around to prevent older 7z versions to break rcodesign.
[tor-browser-build]
* Linux
* Bug 41558: Share descriptions between Linux packages and archives
[tor-browser-build]
* Bug 41569: Use var/display_name in .desktop files [tor-browser-build]
* Android
* Bug 44220: Disable the JS minifier as it produces invalid JS
[tor-browser]
* Bug 41577: Minify JS with UglifyJS on Android x86 [tor-browser-build]
* Bug 41582: Drop --pack-dyn-relocs=relr [tor-browser-build]
* Bug 41583: Align tor and PTs to 16kB on Android [tor-browser-build]
best, -morgan
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