Firefox Notes

First offered to Release channel users on March 18, 2014

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.

Thanks to our contributors linkCheck 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.

We'd also like extend a special thank you to all of the new Mozillians who contributed to Firefox 28!!

New Features

  • New

    Mac OS X: Notification Center support for web notifications

  • New

    Horizontal HTML5 audio/video volume control

  • New

    Support for Opus in WebM

  • New

    VP9 video decoding implemented

  • Changed

    Now that spdy/3 is implemented support for spdy/2 has been removed and servers without spdy/3 will negotiate to http/1 without any penalty

  • Developer

    Support for MathML 2.0 'mathvariant' attribute

  • Developer

    Background thread hang reporting

  • Developer

    Support for multi-line flexbox in layout

  • Fixed

    Various security fixes

Known Issues

  • unresolved

    Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1 has a workaround (see 812695)

  • unresolved

    Echo cancellation on apprtc.appspot.com fails (974537)