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.

52.0

Firefox Release

March 7, 2017

Version 52.0, first offered to Release channel users on March 7, 2017

We'd also like to extend a special thank you to all of the new Mozillians who contributed to this release of Firefox!

New

  • Added support for WebAssembly, an emerging standard that brings near-native performance to Web-based games, apps, and software libraries without the use of plugins.

  • Added automatic captive portal detection, for easier access to Wi-Fi hotspots. When accessing the Internet via a captive portal, Firefox will alert users and open the portal login page in a new tab.

  • Implemented the Strict Secure Cookies specification which forbids insecure HTTP sites from setting cookies with the "secure" attribute. In some cases, this will prevent an insecure site from setting a cookie with the same name as an existing "secure" cookie from the same base domain.

  • Added user warnings for non-secure HTTP pages with logins. Firefox now displays a “This connection is not secure” message when users click into the username and password fields on pages that don’t use HTTPS.

  • Enhanced Sync to allow users to send and open tabs from one device to another.

Fixed

  • Various security fixes

  • Improved text input for third-party keyboard layouts on Windows. This will address some keyboard layouts that

    • have chained dead keys
    • input two or more characters with a non-printable key or a dead key sequence
    • input a character even when a dead key sequence failed to compose a character

Changed

  • Removed support for Netscape Plugin API (NPAPI) plugins other than Flash. Silverlight, Java, Acrobat and the like are no longer supported.

  • Improved experience for downloads:

    • Notification in the toolbar when a download fails
    • Quick access to five most recent downloads rather than three
    • Larger buttons for canceling and restarting downloads
  • On Linux, Firefox now requires PulseAudio to play sound and no longer plays sound directly with ALSA.

  • Removed Battery Status API to reduce fingerprinting of users by trackers

  • When not using Direct2D on Windows, Skia is used for content rendering

  • Migrated Firefox users on Windows XP and Windows Vista operating systems to the extended support release (ESR) version of Firefox.

  • Display (but allow users to override) an “Untrusted Connection” error when encountering SHA-1 certificates that chain up to a root certificate included in Mozilla’s CA Certificate Program. (Note: Firefox continues to permit SHA-1 certificates that chain to manually imported root certificates.) Read more about the Mozilla Security Team’s plans to deprecate SHA-1

Developer

Developer Information