Mozilla Firefox specifications

What's new in version 31.0

  • Add the search field to the new tab page
  • Support of Prefer:Safe http header for parental control.
  • mozilla::pkix as default certificate verifier (learn more)
  • Block malware from downloaded files (learn more)
  • Partial implementation of the OpenType MATH table (section 6.3.6) see documentation about mathematical fonts and the MathML Torture Test for details
  • audio/video .ogg and .pdf files handled by Firefox if no application specified (Windows only)
  • Upper Sorbian [hsb] locale added
  • 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.
  • WebVTT implemented and enabled (learn more)
  • CSS3 variables implemented (learn more)
  • Developer Tools: Add-on Debugger (learn more)
  • Developer Tools: Canvas Debugger (learn more)
  • New Array built-in: Array.prototype.fill() (learn more)
  • New Object built-in: Object.setPrototypeOf() (learn more)
  • CSP 1.1 nonce-source and hash-source enabled by default
  • Developer Tools: Eyedropper tool added to the color picker (learn more)
  • Developer Tools: Editable Box Model (learn more)
  • Developer Tools: Code Editor improvements (learn more)
  • Developer Tools: Console stack traces (learn more)
  • Developer Tools: Copy as cURL (learn more)
  • Developer Tools: Styled console logs (learn more)
  • navigator.sendBeacon enabled by default (learn more)
  • Dialogs spawned from the onbeforeunload event no longer block access to the rest of the browser
  • Search for partially selected link text from context menu


  • Publisher Mozilla
  • Publisher web site
  • Release date July 22, 2014
  • Date added July 22, 2014
  • Version 31.0


System requirements

  • Operating systems Mac OS X 10.8, Mac OS X 10.9, Mac OS X 10.7, Mac OS X 10.6
  • Additional requirements Not available

Download information

  • File size 60.09MB
  • File name Firefox 31.0.dmg


  • Total Downloads 3,238,407
  • Downloads last week 2,844


  • License model Free
  • Limitations Not available
  • Price Not available