Pale Moon 34.0.1

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 34.0.1 (2026-01-22):

• Backed out the expat library update for causing memory inflation and browser hang issues on XUL/XML and SVG files with particularly large attributes.
• Backed out the change of the Javascript PRNG for causing intermittent issues and crashes on 32-bit platforms.

Changes in Pale Moon 34.0.0 (2026-01-20):

New features:

• Our default theme on Windows received a refresh and update. It should integrate better with Windows 11 now, and be more responsive to dark accent colors, among other things.
• Implemented WeakRef. See implementation notes.
• Implemented URL.canParse().
• Implemented the inset-block and inset-inline CSS shorthands.
• Added a preference (privacy.forgetaboutsite.clearPasswords) to control clearing of passwords when using “forget about this site” in the permissions manager, and disabled clearing of passwords by default, since it was considered unexpected behavior by the community.
• Changed our JavaScript PRNG to Xoroshiro128++ to make it more robust while keeping high performance.

Important updates and fixes:

• Re-landed CSS Cascade Layers support after the previous back-out.
• Re-landed CSS color-mix support after the previous back-out. RGB and HSL color spaces only, like previous.
• Implemented viewport overflow propagation logic. See implementation notes.
• Unprefixed CSS -moz-appearance; Pale Moon now accepts the unprefixed CSS appearance keyword. For compatibility, -moz-appearance and -webkit-appearance (if enabled) have been retained, although the long-term plan is to eventually remove the -moz prefixed one, so if you are an extension or theme developer, please consider switching your CSS to use appearance without a prefix.
• Fixed an intermittent but fairly prominent crash-to-desktop due to JavaScript garbage collection on certain modern sites.
• Fixed a crash on sites with certain types of CSP handling.
• Fixed a crash in WASM.
• Updated NSS to 3.90.9 (custom) to pick up several security and stability fixes.
• Updated ICU to v78.1. This is a major uplift for our internationalization subsystem, allowing further future developments for the Internationalization API.
• Updated Emoji support to Unicode 17.
• Updated our expat parser code to a more recent version (2.7.3), fixing various issues.
• Improved handling and rendering of emoji clusters.

Other changes:

• Added support for building on Sparc64 hardware.
• Added support for building for NetBSD on Alpha.
• Added basic support for building on Mac PowerPC (still a work in progress).
• Added basic support for building on LoongArch64 hardware (龍芯 CPUs).
• Added support for running on FreeBSD 15.
• Removed automatic coloring of auto-filled login fields as it would interfere with various browser and system color schemes.
  If preferred, this can be reinstated by users with a userContent.css document or e.g. the Stylem extension by leveraging the :autofill CSS pseudo-class.
• Restored support for in-process NPAPI plugins, allowing plugin use on systems where out-of-process is undesirable.
• Improved JavaScript IonMonkey stability on ARM and Mac SoC hardware.
• Linux GTK builds now always build with gio, and gconf support has been removed.
• Security issues addressed: CVE-2025-13015, CVE-2026-0879 (DiD), CVE-2026-0880 (DiD), CVE-2026-0889 (DiD), CVE-2026-0883, CVE-2026-0886 (DiD), and several others without a CVE designation.

Homepage – https://www.palemoon.org

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

Size: 29.7 MB

DOWNLOAD Pale Moon for Windows x86

DOWNLOAD Pale Moon for Windows x64

DOWNLOAD Pale Moon Portable for Windows x86

DOWNLOAD Pale Moon Portable for Windows x64

DOWNLOAD Pale Moon for Linux x64 – GTK3 tarball

DOWNLOAD Pale Moon for Linux x64 – GTK2 tarball