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)
