# New Alpha Release: Tor Browser 16.0a1
**URL:** https://forum.torproject.org/t/new-alpha-release-tor-browser-16-0a1/20955
**Category:** Tor Browser Alpha Feedback
**Tags:** snowflake, tor-browser
**Created:** [December 16, 2025, 1:57pm UTC](https://forum.torproject.org/t/new-alpha-release-tor-browser-16-0a1/20955 "2025-12-16T13:57:42Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@system](https://forum.torproject.org/u/system)
#### Post date: [December 16, 2025, 1:57pm UTC](https://forum.torproject.org/t/new-alpha-release-tor-browser-16-0a1/20955/1 "2025-12-16T13:57:42Z")
by [ma1](https://blog.torproject.org/author/ma1) | December 16, 2025
Tor Browser 16.0a1 is now available from the [Tor Browser download page](https://www.torproject.org/download/alpha/) and also from our [distribution directory](https://www.torproject.org/dist/torbrowser/16.0a1/).
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](https://blog.torproject.org/future-of-tor-browser-alpha/).
This version includes important [security updates](https://www.mozilla.org/en-US/security/advisories/) 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](https://support.torproject.org/misc/bug-or-feedback/).
⚠️ **Reminder** : Tor Browser Alpha release channel is for [testing only](https://community.torproject.org/user-research/become-tester/). If you are at risk or need strong anonymity, stick with the [stable release channel](https://www.torproject.org/download/).
## Full changelog
The [full changelog](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/raw/main/projects/browser/Bundle-Data/Docs-TBB/ChangeLog.txt) since Tor Browser 15.0a4 is:
- All Platforms
- Updated NoScript to 13.5.1.90101984
- [Bug tor-browser#43792](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/43792): Determine whether noscript\_persist users need to have their NoScript settings migrated
- [Bug tor-browser#43998](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/43998): Rebase Tor Browser Alpha onto 141.0
- [Bug tor-browser#44118](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/44118): Decide how to deal with upstream feature gates in a RR world
- [Bug tor-browser#44280](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/44280): Test stream isolation
- [Bug tor-browser#44333](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/44333): Add the "No AI" version of DuckDuckGo to available search engines
- [Bug tor-browser#44365](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/44365): Fix CSS linting errors introduced for firefox 145
- [Bug tor-browser#44391](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/44391): Restrictions cascade blocks every capability in subframes (e.g. captchas)
- [Bug tor-browser#44408](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/44408): Fix TorDomainIsolator in 146
- [Bug tor-browser#44418](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/44418): Update built-in obfs4 bridges
- [Bug tor-browser-build#41609](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41609): Move back to CDN77 for default snowflake bridge
- [Bug tor-browser-build#41646](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41646): Update lyrebird version to v0.7.0
- [Bug mullvad-browser#483](https://gitlab.torproject.org/tpo/applications/mullvad-browser/-/issues/483): Add the "No AI" version of DuckDuckGo to available search engines
- [Bug mullvad-browser#487](https://gitlab.torproject.org/tpo/applications/mullvad-browser/-/issues/487): Search engines are sorted alphabetically rather than the desired order
- Windows + macOS + Linux
- Updated Firefox to 146.0a1esr
- [Bug tor-browser#44302](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/44302): Fix the flags of some about pages
- [Bug tor-browser#44310](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/44310): Default zoom always resets to 100%
- [Bug tor-browser#44411](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/44411): DownloadsTorWarning.sys.mjs fails to load
- [Bug tor-browser#44419](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/44419): Re-add the moz-toggle title attribute patch
- Linux
- [Bug tor-browser#44273](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/44273): Restore Noto CJK as Jigmo has a too low readability
- [Bug tor-browser#44315](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/44315): Font/text issue with self-upgrade window
- Android
- Updated GeckoView to 146.0a1esr
- [Bug tor-browser#44303](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/44303): Extension update job might never work on Android
- [Bug tor-browser#44324](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/44324): Refactor the NSS no proxy-bypass patch on A-S to avoid -Wunreachable-code
- Build System
- All Platforms
- [Bug tor-browser#43951](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/43951): Include product with the component in triage CSVs
- [Bug tor-browser-build#40903](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/40903): Make xz multi-threaded
- [Bug tor-browser-build#41445](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41445): Better handle bugzilla "Web Compatibility" issues in generate-bugzilla-triage-csv
- [Bug tor-browser-build#41607](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41607): Fix regression from #41373 in tools/count-mar-downloads
- [Bug tor-browser-build#41608](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41608): Add per-platform numbers for incrementals in count-mar-downloads
- [Bug tor-browser-build#41643](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41643): Update toolchains for Firefox 146
- [Bug tor-browser-build#41644](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41644): Self-hosted browser extensions support in relprep.py
- [Bug tor-browser-build#41647](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41647): Add a XZ\_DEFAULTS to set\_default\_env
- [Bug tor-browser-build#41648](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41648): Add a mozconfig to projects/geckoview
- [Bug tor-browser-build#41654](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41654): Make relprep.py update Moat settings
- Windows + macOS + Linux
- [Bug tor-browser-build#41662](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41662): Add python-zstandard to desktop containers
- Windows + Linux + Android
- [Bug tor-browser-build#41580](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41580): Update Go major to 1.25.x
- Updated Go to 1.25.5
- macOS
- [Bug tor-browser-build#41665](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41665): Update macos signing wrapper for new executable gpu-helper.app
- Linux
- [Bug tor-browser-build#41601](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41601): Upstream droppped Linux i686 support
- [Bug tor-browser-build#41627](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41627): Firefox build system needs a more recent version of OpenSSL on Linux
- [Bug tor-browser-build#41632](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41632): Ship Linux aarch64 builds in Alpha Release Channel
- [Bug tor-browser-build#41639](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41639): Remove linux-arm target
- [Bug tor-browser-build#41640](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41640): Clean the GCC config file
- Android
- [Bug tor-browser#44360](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/44360): Patch the vendored Gradle Nimbus plugin
- [Bug tor-browser#44370](https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/44370): Always produce target.maven.zip
- [Bug tor-browser-build#41485](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41485): Retire get\_gradle\_dependencies\_list and create a simple way to update gradle deps
- [Bug tor-browser-build#41573](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41573): Remove Android x86 support
- [Bug tor-browser-build#41617](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41617): Pass page size to zipalign
- [Bug tor-browser-build#41620](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41620): Do not rerun zipalign when signing
- [Bug tor-browser-build#41621](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41621): Remove support using older android build tools when signing 14.5 releases in tools/signing/wrappers/sign-apk
- [Bug tor-browser-build#41628](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41628): android\_ndk\_version and revision can be grouped together
- [Bug tor-browser-build#41636](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41636): Update the scripts to manage Gradle dependencies
- [Bug tor-browser-build#41666](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41666): Normalize the path to tor-expert-bundle.aar
- [Bug tor-browser-build#41669](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/41669): Restore UglifyJS but for Android x86\_64
* * *
This is a companion discussion topic for the original entry at [https://blog.torproject.org/new-alpha-release-tor-browser-160a1](https://blog.torproject.org/new-alpha-release-tor-browser-160a1)
---
### Author:  [@Noino](https://forum.torproject.org/u/Noino)
#### Post date: [December 16, 2025, 4:01pm UTC](https://forum.torproject.org/t/new-alpha-release-tor-browser-16-0a1/20955/2 "2025-12-16T16:01:10Z")
Awesome work, looking forward to testing the new alpha release. Just FYI the 16.0a1 distribution directory link is 404 right now, which means the download page links are dead too.
---
### Author:  [@ebanam](https://forum.torproject.org/u/ebanam)
#### Post date: [December 16, 2025, 5:41pm UTC](https://forum.torproject.org/t/new-alpha-release-tor-browser-16-0a1/20955/3 "2025-12-16T17:41:40Z")
@Noino, thanks for reporting. I believe it should be fixed now.
On a separate note, I am noticing there are some significant updates with this alpha release. For which i have filed: [Update Tor Browser Alpha page with links for aarch64 Linux and drop links for 32-bit linux and Android x86 (#522) · Issues · The Tor Project / Web / tpo · GitLab](https://gitlab.torproject.org/tpo/web/tpo/-/issues/522)