Firefox Notes

First offered to Release channel users on March 24, 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.

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.

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

New Features

  • New

    Horizontal HTML5 audio/video volume control

  • New

    Support for Opus in WebM

  • New

    Estonian [et] locale added

  • New

    Added support for OpenSearch

  • New

    Added settings switch to toggle dynamic toolbar mode

  • New

    VP9 video decoding implemented

  • New

    Awesomebar entries now trigger predictive lookup

  • New

    More native text selection, cut, and copy

  • 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

  • Fixed

    Explore By Touch automatically loading web pages (963000)

  • Fixed

    28.0.1 No H.264 video playback on several Galaxy devices (963612)

  • Fixed

    28.0.1 mobile-only security fix for file: paths

Known Issues

  • unresolved

    Moving Firefox to background while playing a flash video in full screen mode and bring it back to view will freeze the app (see 809055)

  • unresolved

    Some devices running Android 4.3/4.4 may experience playback problems with embedded h.264 video (see 984230)

    Resolved in v29.0a2

  • unresolved

    Crashes interacting with the back button on x86 tablets Galaxy Tab 3 10.1 (see 983211)