⚠️ Change to Mullvad Browser Alpha Channel

From this release, Mullvad Browser Alpha channel will not be based on Firefox ESR, but on the Rapid Release channel. The Rapid Release channel updates every four weeks with new features, while ESR focuses on security updates.

If you are an alpha tester running Mullvad Browser Alpha, you can expect the following changes:

• quicker access to new Firefox features, allowing for longer evaluation periods of their compatibility with Mullvad Browser's privacy and security measures.
• may introduce more bugs and potential security implications.
• potentially a less predictable release cadences.

For Stable users, this means one major feature release per year instead of two.

The rationale behind this change is to reduce developer stress, improve feature development continuity, and spread out the intensive ESR transition work throughout the year, making the development process more effective and sustainable.
The project views this as an experiment, with the option to revert if major issues arise.

For more details, read Tor Project's blog post.

• All Platforms
  • Updated Firefox to 146.0a1esr
  • Updated NoScript to 13.5.1.90101984
  • Updated Mullvad Browser Extension to 0.9.7
  • Updated uBlock Origin to 1.68.0
  • Bug 483: Add the "No AI" version of DuckDuckGo to available search engines [mullvad-browser]
  • Bug 487: Search engines are sorted alphabetically rather than the desired order [mullvad-browser]
  • Bug 496: Rebase Mullvad Browser Alpha onto 146.0a1 [mullvad-browser]
  • Bug 22974: Self-host NoScript Updates [tor-browser]
  • Bug 44118: Decide how to deal with upstream feature gates in a RR world [tor-browser]
  • Bug 44302: Fix the flags of some about pages [tor-browser]
  • Bug 44310: Default zoom always resets to 100% [tor-browser]
  • Bug 44333: Add the "No AI" version of DuckDuckGo to available search engines [tor-browser]
  • Bug 44365: Fix CSS linting errors introduced for firefox 145 [tor-browser]
  • Bug 44391: Restrictions cascade blocks every capability in subframes (e.g. captchas) [tor-browser]
• Windows
  • Bug 479: Fix WebRTC on mingw after the 144 rebase [mullvad-browser]
  • Bug 500: Restore NSIS plugin Makefiles [mullvad-browser]
• Linux
  • Bug 434: Make Linux aarch64 builds available through the Alpha channel [mullvad-browser]
  • Bug 44273: Restore Noto CJK as Jigmo has a too low readability [tor-browser]
  • Bug 44315: Font/text issue with self-upgrade window [tor-browser]

Build System

• All Platforms
  • Bug 493: Automatically check whether the signed build is avaliable on dist.torproject.org before notifying Mullvad for QA [mullvad-browser]
  • Bug 40903: Make xz multi-threaded [tor-browser-build]
  • Bug 41643: Update toolchains for Firefox 146 [tor-browser-build]
  • Bug 41644: Self-hosted browser extensions support in relprep.py [tor-browser-build]
  • Bug 41647: Add a XZ_DEFAULTS to set_default_env [tor-browser-build]
  • Bug 41662: Add python-zstandard to desktop containers [tor-browser-build]
• macOS
  • Bug 41665: Update macos signing wrapper for new executable gpu-helper.app [tor-browser-build]
• Linux
  • Bug 41627: Firefox build system needs a more recent version of OpenSSL on Linux [tor-browser-build]
  • Bug 41632: Ship Linux aarch64 builds in Alpha Release Channel [tor-browser-build]
  • Bug 41639: Remove linux-arm target [tor-browser-build]
  • Bug 41640: Clean the GCC config file [tor-browser-build]