Mozilla Firefox specifications

What's new in version 31.0

  • New Add the search field to the new tab page
  • New Support of Prefer:Safe http header for parental control
  • New mozilla::pkix as default certificate verifier
  • New Block malware from downloaded files
  • 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
  • HTML5 CSS3 variables implemented
  • Developer Developer Tools: Add-on Debugger
  • Developer Developer Tools: Canvas Debugger
  • Developer New Array built-in: Array.prototype.fill()
  • Developer New Object built-in: Object.setPrototypeOf()
  • Developer CSP 1.1 nonce-source and hash-source enabled by default
  • Developer Developer Tools: Eyedropper tool added to the color picker
  • Developer Developer Tools: Editable Box Model
  • Developer Developer Tools: Code Editor improvements
  • Developer Developer Tools: Console stack traces
  • Developer Developer Tools: Copy as cURL
  • Developer Developer Tools: Styled console logs
  • Developer navigator.sendBeacon enabled by default
  • 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


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


System requirements

  • Operating systems Windows 7, Windows 2003, Windows 2000, Windows 8, Windows Vista, Windows XP
  • Additional requirements Not available

Download information

  • File size 30.75MB
  • File name Firefox_Setup_31.0.exe


  • Total Downloads 45,255,235
  • Downloads last week 65,644


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