Download Firefox

Firefox is no longer supported on Windows 8.1 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Firefox is no longer supported on macOS 10.14 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Firefox Privacy Notice

Firefox Beta and Developer Edition
Release Notes

Release Notes tell you what’s new in Firefox. As always, we welcome your feedback. You can also file a bug in Bugzilla or see the system requirements of this release.

55.0beta Firefox Beta

June 14, 2017

Version 55.0beta, first offered to Beta channel users on June 14, 2017

New

  • Launched Windows support for WebVR, bringing immersive experiences to the web. See examples and try working demos at Mozilla VR.

  • Simplified installation process with a streamlined Windows stub installer

    • Firefox for Windows 64-bit is now installed by default on 64-bit systems with at least 2GB of RAM
    • Full installers with advanced installation options are still available
  • Updated Sidebar for bookmarks, history, and synced tabs so it can appear at the right edge of the window as well as the left

  • Pages can be simplified before printing from within Print Preview

  • Updated Firefox for OSX and macOS to allow users to assign custom keyboard shortcuts to Firefox menu items via System Preferences

  • Browsing sessions with a high number of tabs are now restored in an instant

  • Fine-tune your browser performance from the Preferences/Options page.

  • Make screenshots of webpages, and save them locally or upload them to the cloud. This feature will undergo A/B testing and will not be visible for some users.

  • Search suggestions are now enabled by default for users who haven't explicitly opted-out

  • Search with any installed search engine directly from the location bar

  • Added Belarusian (be) locale

Changed

  • Modernized application update UI to be less intrusive and more aligned with the rest of the browser. Only users who have not restarted their browser 8 days after downloading an update or users who opted out of automatic updates will see this change.

  • Firefox does not support downgrades, even though this may have worked in past versions. Users who install Firefox 55+ and later downgrade to an earlier version may experience issues with Firefox.

  • Made the Adobe Flash plugin click-to-activate by default and allowed only on http:// and https:// URL schemes. (This change will not be visible to all users immediately. For more information see the Firefox plugin roadmap)

Developer

  • Sites that don’t use SSL can no longer access Geolocation APIs to determine a user’s physical location

Get the most recent version

All Firefox Beta downloads