Download Mozilla Firefox 66.0 x64 MSI

Download Mozilla Firefox 66.0 x64 MSI for Configuration Manager deployments.

  • No desktop shortcut;
  • English localization;
  • No Updater (no mozilla maintance service);
  • Upgradable in future. (past release)


  • Firefox now prevents websites from automatically playing sound. You can add individual sites to an exceptions list or turn blocking off.
  • Improved search experience:
    • Find a specific webpage faster when you have a lot of tabs open: You can now search within all of your open tabs from the tab overflow menu
    • Easier search via a redesigned new tab in Private Windows
  • Smoother scrolling: Scroll anchoring keeps content from jumping as images and ads load at the top of the page
  • Improved performance and better user experience for extensions:
    • Extensions now store their settings in a Firefox database, rather than individual JSON files, making every site you visit faster
    • A redesigned keyboard shortcuts section in about:addons makes it easier to view and adjust default shortcuts
  • Redesigned certificate error pages help you better understand and resolve issues, including identification of certificate issuers for anti-virus software
  • Added basic support for macOS Touch Bar
  • Experimenting with an improved Pocket experience in New Tab with different layouts and more topical content
  • Improved performance and reduced crash rates by doubling web content loading processes from 4 to 8
  • Easier, passwordless security: Added support for Windows Hello on Windows 10, allowing you to use your face, fingerprint, or external security keys for website authentication


  • The Dark and Light Firefox themes now override the system setting for title bar accent color on Windows 10
  • Linux users: Resolved an issue that caused Firefox to freeze when downloading files
  • Various security fixes


  • System title bar is hidden by default to match Gnome guideline for Linux users


  • DevTools Inspector is now fully usable when the Debugger is paused
  • Lowered priority of setTimeout and setInterval during page load to improve overall page load performance
  • Fixed: <button> element is no longer special cased in event dispatch, per latest specifications

Don’t forget support Authors.


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