Why settle for a basic build of your Firefox browser on Windows Operating Systems when you can have one that performs 25% faster? Mozilla does not provide optimized browser packages for Windows, while many Linux ("from scratch") users get the advantage of a browser built specifically for their system. That needs to change! So, here is the Pale Moon project: Custom-built and optimized Firefox browsers for Windows Operating Systems. Make sure to get the most speed out of your browser.

Of course, getting a faster browser is not just about optimizing the compilation process (building a program from its source code), but also about carefully choosing features and how to choose the best setup. This means that this browser, however extremely close to Firefox, does not have all the functions that Firefox has. A few, carefully selected, features have been disabled that are not in high demand, and that do not interfere with the way web pages are displayed or function; all to maximize speed and efficiency of the browser. Please see the page with technical details to learn exactly what the browser supports, and what it doesn't support. In short, if you need accessibility features or parental controls, then please visit the firefox homepage and get the official, non-optimized build.

Features:

  • Highly optimized for current processors
  • 100% Firefox sourced: As safe as the browser that has seen years of development.
  • Uses slightly less memory because of disabled redundant and optional code
  • Significant speed increases for page drawing and script processing
  • Support for SVG and Canvas
  • Support for Firefox extensions, themes and personas

What's New:

This is a compatibility, bugfix and security update.

  • Updated the browser identity code for website security to more clearly indicate website status.
  • A detailed explanation is available on the forum and beyond the scope of these release notes.
  • Updated unofficial branding to be more generic and more clearly separate unofficial builds from Pale Moon as a product.
  • Please note that this goes hand in hand with an update of our redistribution license, and from this point forward any "New Moon" products are to be considered separate, and not unofficial Pale Moon builds or in any way related to or affiliated with Pale Moon, despite the similarity in name.
  • Added a preference (signon.startup.prompt) to give users the option to ask for the Master Password the moment the application starts (before the main window opens). This allows a workaround for getting multiple Master Password prompts if individual components need access to the password store at the same time.
  • Changed the way download sources are displayed to always use the actual domain downloads are from. In some situations the browser would previously display the domain of the referring page in an inconsistent fashion.
  • Implemented the ES2019 Object.fromEntries() utility function.
  • Implemented the CSS flow-root keyword.
  • (Re-)implemented percentage-based CSS opacity values according to the updated spec.
  • Implemented the last few missing bits for a standards-compliant implementation of JavaScript modules.(preloading, resource: scheme, etc.)
  • Implemented the ResizeObserver DOM API.
  • Fixed a null crash on some websites using CSS clip paths.
  • Updated script handling inside SVGs to only run scripts if they are enabled and permitted, avoiding a potential XSS pitfall.
  • Fixed several memory safety hazards and crashes.
  • Updated the MediaQueryList interface to the updated spec. It now inherits from EventTarget and implements AddEventListener/RemoveEventListener in addition to AddListener/RemoveListener and should improve web compatibility for some sites.
  • Removed support for the archaic and non-standard element.
  • Removed some leftovers from the discontinued plugin update checker service.
  • Removed some internal HPKP implementation leftovers.
  • Cleaned up the Windows widget code to reduce potentially vulnerable direct-dll loads.
  • Security issues fixed: CVE-2020-15676 and CVE-2020-15677
  • Unified XUL Platform Mozilla Security Patch Summary: 2 fixed, 1 defense-in-depth, 7 not applicable.