Pale Moon 33.9.1

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 33.9.1 (2025-10-21):

• Temporarily backed out the implementation of CSS Cascade Layers for causing layout issues on websites. This will re-land when fixed.
• Temporarily backed out the implementation of CSS color-mix for causing crashes. This will re-land when fixed.
• Per request from our user base, the blank page with the Pale Moon logo (default for new tabs) will now have an appropriate title (for e.g. identification in tab and window title).
• Further improved the “copy as cURL” devtools function. (CVE-2025-11713)

Changes in Pale Moon 33.9.0 (2025-09-23):

New features:

• Implemented the CSS4 revert keyword.
• Implemented the clip keyword for overflow. See implementation notes.
• Implemented axis-shorthand parsing of overflow. This should fix some issues with areas being unscrollable on the web.
• Implemented CSS color-mix (RGB and HSL color spaces only).
• Implemented CSS @supports(selector(<complex
selector>)) syntax.
• Implemented CSS Cascade Layers @layer support.
• Implemented support for CSS clip-path:<geometry-box> without actually supplying a clip path to use. See implementation notes.
• Implemented overflow-inline and overflow-block CSS properties.
• Implemented the :autofill CSS pseudo-class. Auto-filled fields will now also be styled by default to indicate autofilling/password manager recall has occurred.
• Implemented the :focus-visible CSS pseudo-class.
• Implemented the prefers-reduced-motion CSS media query. See implementation notes.
• Implemented a minimal version of the visualViewport web API. See implementation notes.

Changes/ fixes:

• Un-prefixed CSS -moz-user-select and aligned with the user-select CSS4 spec.
• Un-prefixed CSS -moz-read-only and -moz-read-write pseudo-classes.
• Improved the handling of X-Content-Type-Options:
nosniff to align more with the spec and expected behavior on the web.
• Added support for FFmpeg 7.0/libavcodec 61.
• Fixed a bug where sub-properties of CSS border-image would not update when the value they inherit from changes.
• Fixed a bug where scrollbar-width was incorrectly treated as an inherited property.
• Fixed an issue where screen/pixel color depth could potentially be mis-reported on Linux.
• Fixed a potential issue with fontconfig on Linux. We now explicitly initialize fontconfig on startup.
• Fixed various issues with vpx on PowerPC architectures.
• Fixed issues when building ffvpx on architectures without assembly support.
• Fixed a memory safety issue in two-position gradient color-stops code.
• Changed the way @import rules are processed. They will now be processed in the order of appearance in the importing stylesheet.
• Changed how TypedArray constructors handle initialization values, aligning with the ECMAScript spec. See implementation notes.
• Changed how Cache-control HTTP headers are parsed if multiple headers are present in a response.
• Made additional improvements to “Copy as cURL” devtools command.
• Security issues addressed: CVE-2025-10536 and CVE-2025-10533 DiD.

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