Log Message:
Update to 31.0

Changelog:
    New
    Add the search field to the new tab page

    New
    Support of Prefer:Safe http header for parental control (learn more)

    New
    mozilla::pkix as default certificate verifier (learn more)

    New
    Block malware from downloaded files (learn more)

    New
    Partial implementation of the OpenType MATH table (section 6.3.6) see \ 
documentation about mathematical fonts and the MathML Torture Test for details

    New
    audio/video .ogg and .pdf files handled by Firefox if no application \ 
specified (Windows only)

    New
    Upper Sorbian [hsb] locale added

    Changed
    Removal of the CAPS infrastructure for specifying site-specific permissions \ 
(via capability.policy.* preferences). Most notably, attempts to use this \ 
functionality to grant access to the clipboard will no longer work. The sole \ 
exception is the checkloaduri permission, which may still be used as before to \ 
allow sites to load file:// URIs.

    HTML5
    WebVTT implemented and enabled (learn more)

    HTML5
    CSS3 variables implemented (learn more)

    Developer
    Developer Tools: Add-on Debugger (learn more)

    Developer
    Developer Tools: Canvas Debugger (learn more)

    Developer
    New Array built-in: Array.prototype.fill() (learn more)

    Developer
    New Object built-in: Object.setPrototypeOf() (learn more)

    Developer
    CSP 1.1 nonce-source and hash-source enabled by default

    Developer
    Developer Tools: Eyedropper tool added to the color picker (learn more)

    Developer
    Developer Tools: Editable Box Model (learn more)

    Developer
    Developer Tools: Code Editor improvements (learn more)

    Developer
    Developer Tools: Console stack traces (learn more)

    Developer
    Developer Tools: Copy as cURL (learn more)

    Developer
    Developer Tools: Styled console logs (learn more)

    Developer
    navigator.sendBeacon enabled by default (learn more)

    Developer
    Dialogs spawned from the onbeforeunload event no longer block access to the \ 
rest of the browser

    Fixed
    Search for partially selected link text from context menu (985824)

    Fixed
    Various security fixes

Fixed in Firefox 31
MFSA 2014-66 IFRAME sandbox same-origin access through redirect
MFSA 2014-65 Certificate parsing broken by non-standard character encoding
MFSA 2014-64 Crash in Skia library when scaling high quality images
MFSA 2014-63 Use-after-free while when manipulating certificates in the trusted cache
MFSA 2014-62 Exploitable WebGL crash with Cesium JavaScript library
MFSA 2014-61 Use-after-free with FireOnStateChange event
MFSA 2014-60 Toolbar dialog customization event spoofing
MFSA 2014-59 Use-after-free in DirectWrite font handling
MFSA 2014-58 Use-after-free in Web Audio due to incorrect control message ordering
MFSA 2014-57 Buffer overflow during Web Audio buffering for playback
MFSA 2014-56 Miscellaneous memory safety hazards (rv:31.0 / rv:24.7)