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Pale Moon is a custom-developed browser derived from Firefox’s open-source code, emphasizing speed, efficiency, and user control. 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
- Uses barely less memory due to disabled redundant and optionally available code
- Significant speed increase for web page drawing and script processing
- Support for HTML5 and WebGL (v4)
- Stability: fewer browser crashes.
- Support for SVG and Canvas, and downloadable fonts, together with WOFF
- Support for OOPP (Out-of-process plugin execution)
The Pale Moon browser introduces user interface changes more conservatively, helping maintain a familiar browsing experience. 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.
Pale Moon – Pros & Cons
| Pros | Cons |
|---|---|
| ✓ Optimized for modern processors to deliver faster page rendering and improved script execution on supported hardware. | ✗ Some modern websites and web applications may not be fully compatible because Pale Moon uses its own independent browser platform. |
| ✓ Open-source browser that supports extensions, themes, and Firefox profile migration for a familiar browsing experience. | ✗ Extension compatibility is more limited than current mainstream Firefox releases, and not all modern Firefox add-ons are supported. |
| ✓ Uses less memory by removing unnecessary components, helping improve efficiency on compatible systems. | ✗ Prioritizes a traditional interface over adopting the latest browser design changes, which may not appeal to every user. |
| ✓ Supports modern web technologies such as HTML5, WebGL, SVG, Canvas, downloadable fonts, and out-of-process plugin execution. | ✗ Requires a processor with SSE2 instruction support, making it incompatible with some very old hardware. |
| ✓ Receives regular security updates and code audits to address vulnerabilities and improve browser stability. | ✗ Has a smaller development community and ecosystem than major browsers, resulting in fewer third-party extensions and integrations. |
Frequently Asked Questions
Is Pale Moon open source?
Yes. Pale Moon is an open-source web browser that maintains its own independent codebase, originally derived from Firefox. Its source code is publicly available, allowing the community to review and contribute to its development.
What is the difference between Pale Moon and Mozilla Firefox?
Both browsers share a common heritage but have evolved independently. Pale Moon focuses on a traditional interface, user customization, and its own browser platform. Mozilla Firefox emphasizes modern web technologies, rapid feature updates, and broader compatibility with current web standards.
Can Pale Moon import bookmarks and settings from Firefox?
Yes. It includes a migration tool that can import supported Firefox profiles, including bookmarks, settings, and other browsing data. This makes it easier to switch without starting from scratch.
Does Pale Moon support Chrome extensions?
No. Pale Moon does not support Google Chrome extensions because it uses a different browser platform. Instead, it supports extensions designed for the Pale Moon ecosystem, including those based on legacy Firefox extension technology.
What’s New in Pale Moon 34.3.2
Release Date 2026-08-04
- Implemented the URL.Parse() convenience function.
- Added multiple bounds checks on internal browser functions to avoid potential out-of-bounds accesses, underflows, and overflows. (DiD)
- Fixed several issues with loading and parsing content-supplied fonts.
- Set a lower limit on the frequency for audio samples to avoid an entire class of potential bugs related to audio loading, processing, and playback.
- Audio formats with sample rates below 8 kHz, commonly regarded as the minimum for telephone- or walkie-talkie-quality audio, are now rejected.
- Fixed a potential issue in CSS rounded corners with dotted styling.
- Image elements in forms are no longer associated if they are not in the same subtree.
- Made image animation checks stricter to avoid potential issues if decoding would be slow.
- Video region checks are now stricter to avoid issues with malformed video files.
- Updated NSS to 3.90.13.0 (UXP), addressing all applicable security issues from NSS upstream.
- Conducted another extensive security audit covering more than 200 Mozilla security vulnerabilities, with most found to be unrelated to the Pale Moon codebase, primarily those involving e10s/IPC.
- Security issues addressed include CVE-2026-16353, CVE-2026-16408, CVE-2026-16389, and many others that have not been assigned CVE IDs.
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
