Firefox Beta Notes

Version 41.0beta, first offered to Beta channel users on August 12, 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

    SVG images can be used as favicons

  • New

    Firefox Hello now includes instant messaging

  • New

    Enhance IME support on Windows (Vista +) using TSF (Text Services Framework)

  • New

    Ability to set a profile picture for your Firefox Account

  • Changed

    Type 2 Add-ons (Extensions) that have not been signed by Mozilla will be disabled by default. Read more about Add-on signing in Firefox

  • Changed

    Memory overhead of AdBlock Plus has been greatly reduced

  • Changed

    WebRTC now requires perfect forward secrecy

  • Changed

    WARP is disabled on windows 7

  • Changed

    Improved image decoding with performance up to twice as fast on some devices especially while scrolling

  • Changed

    Smoother and more reliable CSS animations via asynchronous animations

  • HTML5

    CSS Font Loading API enabled by default

  • HTML5

    Copy/Cut Web content from JavaScript with document.execCommand("cut"/"copy")

  • HTML5

    MessageChannel and MessagePort API enabled by default

  • HTML5

    Navigator.onLine now varies with actual internet connectivity (Windows and Mac OS X only)

  • HTML5

    Added support for the transform-origin property on SVG elements

  • HTML5

    Implemented Cache API for querying named caches that are accessible window, Worker, and ServiceWorker

  • Developer

    Screenshot a node or element from markup view with the Screenshot Node context menu item

  • Developer

    Copy element CSS rule declarations with the Copy Rule Declaration context menu item in the Inspector

  • Developer

    Network requests can be exported in HAR format

  • Developer

    Removed support for binary XPCOM components in extensions, use addon SDK "system/child_process" pipe mechanism for native binaries instead

  • Developer

    Pseudo-Class panel in the Inspector

  • Developer

    View HTML source in a tab

  • Developer

    Quickly add new CSS rule with New Rule button in the Inspector

  • Fixed

    Picture element does not react to resize/viewport changes