Pale Moon 15.3.1

Pale Moon is a custom-built and optimized Firefox-based browser for Windows operating systems with current, high performance processors. It looks identical to the standard Firefox browser and supports Firefox extensions, themes and identities.


  • Highly optimized for modern 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
  • Stability: experience fewer browser crashes.
  • Support for SVG and Canvas, and downloadable fonts including WOFF
  • Support for HTML5 and WebGL (v4+)
  • Support for Firefox extensions (add-ons), themes and personas
  • Support for OOPP (Out-of-process plugin execution)
  • Able to use existing Firefox bookmarks and settings with this migration tool

New and changed in this version:

Pale Moon 15.3.1 is a bugfix and performance release with a number of security, stability and efficiency fixes:


  • Reduce non-incremental GC occurrences (reduce lag in Javascript)
  • More efficient CPU usage for JS and Canvas
  • Pale Moon x64: Performance improvements

Security fixes:

  • Security fixes for CVE-2012-5840, CVE-2012-5839, CVE-2012-4210, CVE-2012-4207 and CVE-2012-4214.
  • Fix for methodjit assertion issue (bug #781859)
  • Fix for potentially exploitable crash in XPConnect (bug #809674)
  • Fix for potentially exploitable crash in layout engine (bug #791601)
  • Fix for potentially exploitable crash in JS string handling (bug #778603)
  • Fix for potentially exploitable crash in GIF decoder (bug #789046)
  • Fix for potentially exploitable crash in image decoder (bug #802168)
  • Fix for use-after-free in editor lib (bug #795708)
  • Fix for potentially exploitable crash in SVG (bug #793848)
  • Fix for out-of-bounds read when blurring (bug #783041)
  • Fix for potentially exploitable crash in text editor (bug #798677)
  • Prevent URL spoofing through prompts (bug #700080)


  • Fix for font rendering issues on Windows 8 (cairo+azure)
  • Status bar options: Russian locale fixed
  • Fix for status bar address bar linkover ghosting
  • Fix for browser hang in some WebM video content
  • Don't allow alert/confirm/prompt in onbeforeunload, onunload and onpagehide (bug# 391834)

Download: Pale Moon 15.3.1 | 13.9 MB (Freeware)
Download: Portable Pale Moon 15.3.1 | 15.8 MB
Download: Pale Moon 15.3.1 x64 | 15.2 MB
View: Homepage | Release Notes

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