Firefox Release

August 6, 2013

Version 23.0, first offered to Release channel users on August 6, 2013

We'd also like to extend a special thank you to all of the new Mozillians who contributed to Firefox 23!


  • Mixed content blocking enabled to protects users from man-in-the-middle attacks and eavesdroppers on HTTPS pages (learn more)

  • Options panel created for Web Developer Toolbox



  • "Enable JavaScript" preference checkbox has been removed and user-set values will be reset to the default

  • Updated Firefox Logo

  • Improved about:memory's functional UI

  • Simplified interface for notifications of plugin installation

  • Users can now switch to a new search provider across the entire browser

  • Enabled DXVA2 on Windows Vista+ to accelerate H.264 video decoding

  • CSP policies using the standard syntax and semantics will now be enforced

  • "Load images automatically" and Always show the tab bar" checkboxes removed from preferences and reset to defaults. Want to hide one tab? Try this add-on.

  • <input type='file'> rendering improvements (see bug 838675)

  • Replace fixed-ratio audio resampler in webrtc.org capture code with Speex resampler and eliminate pseudo-44000Hz rate


  • Developer Information
  • <blink>Dropped blink effect from text-decoration: blink; and completely removed <blink> element </blink>

  • New feature in toolbox: Network Monitor

  • Added unprefixed requestAnimationFrame

  • Implemented a global browser console

  • Write more accessible pages on touch interfaces with new ARIA role for key buttons

  • Social share functionality

  • HTML5 <input type="range"> form control implemented


  • If you try to start Firefox using a locked profile, it will crash (see 573369)

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