See what’s new in Firefox!

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

  • 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 with any installed search engine directly from the location bar

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

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

  • 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

Developer Information