by ma1 | December 16, 2025
Tor Browser 16.0a1 is now available from the Tor Browser download page and also from our distribution directory.
This is the first Tor Browser Alpha release based on Firefox Rapid Release: read more about this important change in The Future of Tor Browser Alpha.
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.
⚠️ Reminder: Tor Browser Alpha release channel is for testing only. If you are at risk or need strong anonymity, stick with the stable release channel.
Full changelog
The full changelog since Tor Browser 15.0a4 is:
- All Platforms
- Updated NoScript to 13.5.1.90101984
- Bug tor-browser#43792: Determine whether noscript_persist users need to have their NoScript settings migrated
- Bug tor-browser#43998: Rebase Tor Browser Alpha onto 141.0
- Bug tor-browser#44118: Decide how to deal with upstream feature gates in a RR world
- Bug tor-browser#44280: Test stream isolation
- Bug tor-browser#44333: Add the "No AI" version of DuckDuckGo to available search engines
- Bug tor-browser#44365: Fix CSS linting errors introduced for firefox 145
- Bug tor-browser#44391: Restrictions cascade blocks every capability in subframes (e.g. captchas)
- Bug tor-browser#44408: Fix TorDomainIsolator in 146
- Bug tor-browser#44418: Update built-in obfs4 bridges
- Bug tor-browser-build#41609: Move back to CDN77 for default snowflake bridge
- Bug tor-browser-build#41646: Update lyrebird version to v0.7.0
- Bug mullvad-browser#483: Add the "No AI" version of DuckDuckGo to available search engines
- Bug mullvad-browser#487: Search engines are sorted alphabetically rather than the desired order
- Windows + macOS + Linux
- Updated Firefox to 146.0a1esr
- Bug tor-browser#44302: Fix the flags of some about pages
- Bug tor-browser#44310: Default zoom always resets to 100%
- Bug tor-browser#44411: DownloadsTorWarning.sys.mjs fails to load
- Bug tor-browser#44419: Re-add the moz-toggle title attribute patch
- Linux
- Bug tor-browser#44273: Restore Noto CJK as Jigmo has a too low readability
- Bug tor-browser#44315: Font/text issue with self-upgrade window
- Android
- Updated GeckoView to 146.0a1esr
- Bug tor-browser#44303: Extension update job might never work on Android
- Bug tor-browser#44324: Refactor the NSS no proxy-bypass patch on A-S to avoid -Wunreachable-code
- Build System
- All Platforms
- Bug tor-browser#43951: Include product with the component in triage CSVs
- Bug tor-browser-build#40903: Make xz multi-threaded
- Bug tor-browser-build#41445: Better handle bugzilla "Web Compatibility" issues in generate-bugzilla-triage-csv
- Bug tor-browser-build#41607: Fix regression from #41373 in tools/count-mar-downloads
- Bug tor-browser-build#41608: Add per-platform numbers for incrementals in count-mar-downloads
- Bug tor-browser-build#41643: Update toolchains for Firefox 146
- Bug tor-browser-build#41644: Self-hosted browser extensions support in relprep.py
- Bug tor-browser-build#41647: Add a XZ_DEFAULTS to set_default_env
- Bug tor-browser-build#41648: Add a mozconfig to projects/geckoview
- Bug tor-browser-build#41654: Make relprep.py update Moat settings
- Windows + macOS + Linux
- Bug tor-browser-build#41662: Add python-zstandard to desktop containers
- Windows + Linux + Android
- Bug tor-browser-build#41580: Update Go major to 1.25.x
- Updated Go to 1.25.5
- macOS
- Bug tor-browser-build#41665: Update macos signing wrapper for new executable gpu-helper.app
- Linux
- Bug tor-browser-build#41601: Upstream droppped Linux i686 support
- Bug tor-browser-build#41627: Firefox build system needs a more recent version of OpenSSL on Linux
- Bug tor-browser-build#41632: Ship Linux aarch64 builds in Alpha Release Channel
- Bug tor-browser-build#41639: Remove linux-arm target
- Bug tor-browser-build#41640: Clean the GCC config file
- Android
- Bug tor-browser#44360: Patch the vendored Gradle Nimbus plugin
- Bug tor-browser#44370: Always produce target.maven.zip
- Bug tor-browser-build#41485: Retire get_gradle_dependencies_list and create a simple way to update gradle deps
- Bug tor-browser-build#41573: Remove Android x86 support
- Bug tor-browser-build#41617: Pass page size to zipalign
- Bug tor-browser-build#41620: Do not rerun zipalign when signing
- Bug tor-browser-build#41621: Remove support using older android build tools when signing 14.5 releases in tools/signing/wrappers/sign-apk
- Bug tor-browser-build#41628: android_ndk_version and revision can be grouped together
- Bug tor-browser-build#41636: Update the scripts to manage Gradle dependencies
- Bug tor-browser-build#41666: Normalize the path to tor-expert-bundle.aar
- Bug tor-browser-build#41669: Restore UglifyJS but for Android x86_64
- All Platforms
This is a companion discussion topic for the original entry at https://blog.torproject.org/new-alpha-release-tor-browser-160a1