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Pale Moon

Pale Moon
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Pale Moon is a custom-built and speed optimized Firefox browser. The project uses contributed Open Source code to create a full-featured, speed optimized browser based on Firefox browser.

Having seen the advantages on other systems (e.g. Linux) with regards to programs being compiled specifically for the capabilities of the machine it is installed on, it became obviously clear that Windows users were at a disadvantage.

Mozilla only releases windows executables with maximum compatibility in mind, meaning that Firefox is made to run on as many different systems as possible, sacrificing efficiency and speed in the process to be compatible with, by current standards, absolutely ancient hardware.

Mozilla does not provide optimized browser packages for Windows. That means you may be lose speed and efficiency when you use your browser.

That needs to change. Therefore Pale Moon project offers custom-built and optimized Firefox browsers for Windows Operating Systems. Make sure to get the most speed and efficiency out of your browser!

Pale Moon Main features:

  • Highly optimized for modern processors
  • 100% Firefox sourced: As safe as the browser that has seen years of development.
  • Support for Firefox extensions (add-ons), themes and personas
  • Able to use existing Firefox profiles, bookmarks and settings with this migration tool
  • Uses slightly less memory because of disabled redundant and optional code
  • Significant speed increases for page drawing and script processing
  • Support for HTML5 and WebGL (v4)
  • Stability: experience fewer browser crashes.
  • Support for SVG and Canvas, and downloadable fonts including WOFF
  • Support for OOPP (Out-of-process plugin execution)

Users will find a slightly more conservative approach to changes in the user interface in the Pale Moon browser. It, although very close to Firefox, is (now more obviously so than before) a different product. However, these differences in layout do not prevent anyone from configuring their browser interface to exactly the way they want it to look and work. Including like Mozilla Firefox’s default layout if they so wish.

Changes in Pale Moon (2022-08-02):

  • This is a small out-of-band update to address the fact that the final builds did not include the intended NSS library update.

Changes in Pale Moon 31.2.0 (2022-08-02):

  • Implemented CSS white-space: break-spaces for web compatibility.
  • Implemented Intl.RelativeTimeFormat for web compatibility.
  • Implemented “Origin header CSRF mitigation”. This is still disabled by default to investigate potential issues with CloudFlare-backed sites.
  • Implemented support for async generator methods in JavaScript.
  • Added preliminary support for building on Apple Silicon like M1/M2 SoC.
  • Added support for building with Visual Studio 2022.
  • Improved the handling of CSS “sticky” elements in tables.
  • Improved stack size limits on all platforms. See implementation notes.
  • Updated function.toString handling to align with the updated JavaScript spec. This should improve web compatibility.
  • Updated Unicode support to Unicode v11, and updated the ICU library accordingly. Building without ICU is no longer supported.
  • Updated many in-tree third-party libraries to pick up various performance and stability improvements.
  • Updated site-specific user-agent overrides to work around issues with Google fonts, Citi bank (again!) and MeWe.
  • Removed some leftover (and unused) telemetry code in the platform and front-end.
  • Fixed an issue with VP9 video playback on Windows on some systems.
  • Fixed an issue with the add-ons manager not properly handling empty update URLs.
  • Fixed a major performance regression on *nix based systems due to incorrect thread handling.
  • Fixed volume handling when building with the sndio audio back-end.
  • Pale Moon no longer applies content security policies to documents that are explicitly loaded as data documents or to images. See implementation notes.
  • Cleaned up some unnecessary code from the source tree for unused build back-ends, Firefox marketplace “apps”, and the rather ridiculous moz://a protocol handler.
  • Updated NSS to 3.52.8 to pick up several defense-in-depth security fixes.
  • UXP Mozilla security patch summary: 3 DiD, 12 not applicable.

Changes in Pale Moon 31.1.1 (2022-07-07):

  • Updated the list of blocked external protocol handlers to combat abuse of OS-supplied services on Windows.
  • Fixed a potential issue with revoked site certificates when connecting through a proxy.
  • Updated NSS to 3.52.7 to pick up some security fixes.
  • Updated site-specific user agent overrides to work around bad sniffing practices of dropbox and vimeo.
  • Security issues addressed: CVE-2022-34478, CVE-2022-34476, CVE-2022-34480 DiD, CVE-2022-34472, CVE-2022-34475 DiD, CVE-2022-34473 DiD, CVE-2022-34481 and a memory safety issue that doesn’t have a CVE number.
  • UXP Mozilla security patch summary: 4 fixed, 4 DiD, 2 rejected, 11 not applicable.

Changes in Pale Moon 31.0.0 (2022-05-10):

  • We’re once again accepting the installation of legacy Firefox extensions alongside our own Pale Moon exclusive extensions. As always, please note that using extensions for an old version of a different browser is entirely at your own risk and we obviously cannot and will not provide much (if any) support for their use. Firefox extensions will be indicated with an orange dot in the Add-ons Manager in the browser. This will include the converted extensions for the few of you who are coming from recalled versions with -fxguid suffixes.
  • Implemented “optional chaining” (thanks, FranklinDM!).
  • Implemented setBaseAndExtent for text selections.
  • Implemented queueMicroTask() “pseudo-promise” callbacks.
  • Implemented accepting unit-less values for rootMargin in Intersection observers for web compatibility, making it act more like CSS margin as one would expect.
  • Improvements to CSS grid and flexbox rendering and display following spec changes and improving web compatibility.
  • Improved performance of parallel web workers in JavaScript.
  • Improved display of cursive scripts (on Windows). Good-bye Comic Sans!
  • Updated various in-tree libraries.
  • Added support for extended VPx codec strings in media delivery via MSE (RFC-6381).
  • Fixed a long-time regression where the browser would no longer honor old-style body and iframe body margins when indicated in the HTML tags directly instead of CSS. This improves compatibility with particularly old and/or archived websites.
  • Fixed several crashes and stability issues.
  • Added a licensing screen to the Windows installer to clarify the browser’s licensing. In other installations, you may find this licensing statement in the added license.txt file in the browser installation location.
  • Removed all Google SafeBrowsing/URLClassifier service code.
  • Restored Mac OS X code and buildability in the platform.
  • Removed the non-standard ArchiveReader DOM API that was only ever a prototype implementation.
  • Removed most of the last vestiges of the invasive Mozilla Telemetry code from the platform. This potentially improves performance on some systems.
  • Removed leftover Electrolysis controls that could sometimes trick parts of the browser into starting in a (very broken) multi-process mode due to some plumbing for it still being present, if users would try to force the issue with preferences. Obviously, this was a footgun for power users.
  • Removed more Android/Fennec code (on-going effort to clean up our code).
  • Removed the Marionette automated testing framework.
  • Security issues addressed: CVE-2022-29915, CVE-2022-29911, and several issues that do not have a CVE number.
  • UXP Mozilla security patch summary: 4 fixed, 1 DiD, 19 not applicable.

Changes in Pale Moon 29.4.6 (2022-04-12):

  • Fixed a potential crash issue on
  • Updated NSS to 3.52.4 to address security issues.
  • Fixed some thread locking issues. DiD
  • Worked around a Mesa driver bug that could cause crashes.
  • Fixed a potential resource access issue in devtools. DiD
  • Security issues with CVEs addressed: CVE-2022-1097, CVE-2022-28285 (DiD) and CVE-2022-28283 (DiD).
  • UXP Mozilla security patch summary: 1 fixed, 5 DiD, 2 rejected, 23 not applicable.

Homepage –

Minimum System Requirements:

  • Windows 7, 8, 8.1, 10,11
  • Windows Server 2008 R2 or later
  • A processor with SSE2 instruction support
  • 1 GB of RAM
  • At least 200 MB of free (uncompressed) disk space