Pale Moon is a custom-built, speed-optimized browser based on the open-source code of the Firefox browser. It focuses on delivering an efficient, full-featured browsing experience with strong performance and a classic design.
After observing the benefits of other systems (e.g., Linux), where programs are compiled specifically for a machine’s capabilities, it became clear that Windows users were at a disadvantage.
Mozilla prioritizes maximum compatibility for its Windows executables. This means Firefox is designed to run on the widest possible range of systems, often sacrificing efficiency and speed to support even what is, by current standards, legacy hardware.
Mozilla doesn’t provide optimized browser packages for Windows. This means you might experience reduced speed and effectiveness when using your browser.
To address this, the Pale Moon project offers custom-built and optimized Firefox-based browsers for Windows. Experience maximum speed and efficiency from your browser!
Pale Moon Main options
- 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 make use of the present Firefox profiles, bookmarks, and settings with this migration tool
- Use barely less memory due to disabled redundant and optionally available code
- Significant speed will increase for web page drawing and script processing
- Support for HTML5 and WebGL (v4)
- Stability: expertise in fewer browser crashes.
- Support for SVG and Canvas, and downloadable fonts, together with WOFF
- Support for OOPP (Out-of-process plugin execution)
Users will notice a slightly more conservative approach to user interface changes in the Pale Moon browser. It, although very close to Firefox, is (now more obviously so than before) a different product. However, these structural variations do not prevent anyone from configuring their browser interface to look and work exactly as they want, including using Mozilla Firefox’s default layout if desired.
What’s New 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.
- Mozilla-related security issues CVE-2025-59375 and CVE-2026-4726 had already been addressed in the browser before this release.
Official 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 for Linux x64 – GTK3 tarball
DOWNLOAD for Linux x64 – GTK2 tarball
