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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 the 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 losing 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 exactly the way they want it to look and work. Including Mozilla Firefox’s default layout if they so wish.

Homepage – https://www.palemoon.org

Minimum System Requirements:
  • Windows 7, 8, 8.1, 10, Server 2008 R2 or later
  • A processor with SSE2 instruction support
  • 1 GB of RAM
  • At least 200 MB of free (uncompressed) disk space

This is a new milestone release!
Following the change in direction, as announced on the forum and directly driven by user feedback and community input, Pale Moon is abandoning its own GUID (globally unique identifier) and adopting Firefox’s GUID instead to provide maximum compatibility with old and unmaintained Firefox extensions alongside those that are maintained on our add-ons site.
Please understand that this gives more freedom for people to use potentially incompatible and old/insecure browser extensions, but also means we will have a more “hands-off” approach to it from this point forward which as a consequence means you will have to resolve more issues yourself and take more care, especially when using external/old extensions.
Please note that our current add-ons site will, for a while, serve both older versions of Pale Moon and newer ones in a side-by-side manner, and you mustn't spoof your user agent when visiting the add-ons site or you may be served the incorrect type of add-ons or add-on updates, or not receive them at all.

In addition, our platform code has been changed to a more streamlined version over the past months and UXP is no longer used (or maintained) by us in this milestone. UXP has been released to the community for maintenance and coordination to continue building where desired. Instead, we are now building on the Goanna Runtime Environment™ (or GRE for short) focusing more tightly on the Goanna rendering engine and cutting out support for unmaintainable components and target platforms. More details about this change will follow in-depth documentation on the developer site and/or the forum.

Due to the extensive internal changes in the source tree, these release notes focus only on relevant changes in the browser with regards to implementations, extensions, and security/bug fixes, and are by no means exhaustive.

Most notable user-facing/implementation changes:

  • Implemented Global Privacy Control, taking the place of the unenforceable “DNT” (Do Not Track) signal. If you previously enabled DNT, then this preference will be adopted for Global Privacy Control (GPC). Through GPC, you indicate to websites that you do not want them to share or sell your data.
  • “Default browser” controls in preferences have been moved to “General”.
  • Updated emoji support to Twemoji 13.1.
  • Implemented Selection.setBaseAndExtent() for web compatibility.
  • Implemented queueMicroTask() for web compatibility.

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