Firefox Beta Notes

Version 40.0beta, first offered to Beta channel users on July 3, 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

    Support for Android Presentation API for screen casting

  • New

    Download protection from potentially unwanted software

  • New

    Long press on back/forward navigation buttons in app menu to bring up history list

  • New

    Smoother and more reliable CSS animations via asynchronous animations

  • Changed

    JPEG images use less memory when scaled and can be painted faster

  • HTML5

    Support for new Unicode 8.0 skin tone emoji

  • HTML5

    IndexedDB transactions are now non-durable by default

  • HTML5

    Implemented AudioBufferSourceNode.detune to modulate playback rate in cents

  • Developer

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