Pale Moon 34.2.0

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 34.2.0 (2026-04-07):

New features:

• Implemented ES2018 Proxy ownKeys duplicate-key invariant.
• Implemented ES2022 Error.cause property.
• Implemented support for oklab and oklch color spaces in CSS.
• Implemented ES2024 object.GroupBy.
• Implemented the remainder of the ES2023 Change Array by Copy proposal (toSpliced(), with(), and TypedArray versions of toReversed(), toSorted() and with()).
• Implemented AudioNode constructors.
• Implemented support for nested CSS grammar.
• Implemented the window.MathMLElement global.

Changes/fixes:

• Fixed a crash related to WeakRef use.
• Fixed stack exhaustion crashes as a result of top-level await in modules.
• Updated our expat parser library to 2.7.4, fixing various issues.
• Updated url.CanParse() to allow custom schemes.
• Updated document.currentScript to align with the currently used spec.
• Fixed a crash due to infinite recursion.
• Fixed a crash on MacOS due to WebGL attribute arrays.
• Fixed a crash related to pointer @media queries in CSS.
• Fixed a crash related to the spellchecker when handling input fields in Shadow DOM.
• Future-proofed whitespace handling in ParseDate in light of Unicode variable whitespace use.
• Removed irrelevant plugin preferences when plugin support isn’t built into the browser (non-standard builds/forks).
• Improved support for the mimalloc memory allocator.
• Improved support for LoongArch CPUs.
• Added special handling for certain MacOS system fonts.
• Removed leftover code for unsupported Itanium, 32-bit Sparc and other old architectures.
• Added a workaround for CloudFlare image resizing, since it requires more opaque URL handling to function.
  This workaround is controlled with the new preference network.url.cloudflare_image_resizing.enabled (default true). See implementation notes.
• Security issues addressed: CVE-2026-4707 (DiD), CVE-2026-4690 (DiD), CVE-2026-4727 (DiD), and others without a CVE designation.
  A note that Mozilla-relevant security issues CVE-2025-59375 and CVE-2026-4726 had already been addressed in the browser before this release.

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: 29.8 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