Firefox Beta Notes

Version 39.0beta, first offered to Beta channel users on May 28, 2015

Check out "What’s New" and "Known Issues" for this version of Firefox below. As always, you’re encouraged to tell us what you think, or file a bug in Bugzilla. If interested, please see the complete list of changes in this release.

What’s New

  • New

    Share Hello URLs with social networks

  • New

    Project Silk: Smoother animation and scrolling (Mac OS X)

  • New

    Support for 'switch' role in ARIA 1.1 (web accessibility)

  • New

    SafeBrowsing malware detection lookups enabled for downloads (Mac OS X and Linux)

  • New

    Support for new Unicode 8.0 skin tone emoji

  • Changed

    Removed support for insecure SSLv3 for network communications

  • Changed

    Disable use of RC4 except for temporarily whitelisted hosts

  • Changed

    The malware detection service for downloads now covers common Mac file types (Bug 1138721)

  • Changed

    NPAPI Plug-in performance improved via asynchronous initialization

  • Changed

    Performance of displaying dashed lines is improved (Mac OS X) (Bug 1123019)

  • HTML5

    List-style-type now accepts a string value

  • HTML5

    Enable the Fetch API for network requests from dedicated, shared and service workers

  • HTML5

    Cascading of CSS transitions and animations now matches the current spec

  • HTML5

    Implement <link rel="preconnect">allowing anticipation of a future connection without revealing any information

  • HTML5

    Added support for CSS Scroll Snap Points

  • Developer

    Drag and drop enabled for nodes in Inspector markup view

  • Developer

    Webconsole input history persists even after closing the toolbox

  • Developer

    Cubic bezier tooltip now shows a gallery of timing-function presets for use with CSS animations

  • Developer

    localhost is now available offline for WebSocket connections

  • Fixed

    Improve performance for IPv6 fallback to IPv4

  • Fixed

    Fix incomplete downloads being marked as complete by detecting broken HTTP1.1 transfers

  • Fixed

    The Security state indicator on a page now correctly ignores loads caused by previous pages

  • Fixed

    Fixed an issue where a Hello conversation window would sometimes fail to open

Known Issues