Firefox 63 for Desktop & Android Released with Windows 10 Dark Mode & Protection from Cross-Site Tracking


Mozilla has released Firefox Quantum 63 for desktop and Android with performance improvements. For those on Windows 10, Firefox 63 enables users to match the browser theme with their system's dark mode. The latest version also promises to offer improved protection from tracking cookies to prevent third party firms from monitoring your browsing activity as you move around the web.

"Starting with Firefox 63, all desktop versions of Firefox include an experimental cookie policy that blocks cookies and other site data from third-party tracking resources," the browser maker wrote. "More specifically, it prevents trackers from following users around from site to site and collecting information about their browsing habits."

Firefox 96 Drops for Desktop and Android

You can head over to Firefox options > Preferences > Privacy & Security > Content Blocking > Third party cookies and select "Trackers (recommended)."

Release notes of Firefox 63.0 for desktop and Android

- New for Android

  • Added support for Picture-In-Picture video
  • Started using notification channels
  • Locales added: English from Canada (en-CA), and Ligurian (lij)

Changed: App now targets Oreo with security and performance improvements and support for new features

- Performance and visual improvements for Windows users

  • Moved the build infrastructure of Firefox on Windows to the Clang toolchain, bringing important performance gains
  • Firefox theme now matches the Windows 10 OS Dark and Light modes

- Performance improvements for macOS users

  • Improved reactivity
  • Faster tab switching
  • WebGL power preferences allow non-performance-critical applications and applets to request the low-power GPU instead of the high-power GPU in multi-GPU systems

- Added content blocking, a collection of Firefox settings that offer users greater control over technology that can track them around the web. In 63, users can opt to block third-party tracking cookies or block all trackers and create exceptions for trusted sites that don’t work correctly with content blocking enabled.

- WebExtensions now run in their own process on Linux

- Firefox now warns about having multiple windows and tabs open when quitting from the main menu

- Firefox now recognizes the operating system accessibility setting for reducing animation

- Added search shortcuts for Top Sites: Amazon and Google appear as Top Sites tiles on the Firefox Home (New Tab) page. When selected these tiles will change focus to the address bar to initiate a search. Currently in US only.


  • Resolved an issue that prevented the address bar from autofilling bookmarked URLs in certain cases


  • In the Library, the Open in Sidebar feature for individual bookmarks was removed
  • The option to Never check for updates was removed from about:preferences. You can use the DisableAppUpdate enterprise policy as a substitute.
  • The Ctrl+Tab shortcut now displays thumbnail previews of your tabs and cycles through tabs in recently used order. This new default behavior is activated only in new profiles and can be changed in preferences.

Firefox Quantum 63.0 for Windows, Linux and Mac and Firefox for Android 63.0 are both available now for download. You can head over here to read the release notes in detail and download the latest version of the browser.