See what’s new in Firefox!

Release Notes tell you what’s new in Firefox. As always, we welcome your feedback. You can also file a bug in Bugzilla or see the complete list of changes in this release.

31.0

Firefox Release

July 22, 2014

Version 31.0, first offered to Release channel users on July 22, 2014

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

New

Fixed

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.

Developer

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

  • Developer Tools: Canvas Debugger (learn more)

  • navigator.sendBeacon enabled by default (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)

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

Developer Information

HTML5

unresolved

  • Mac OS X: cmd-L no longer opens a new window when no window is available (1008793)

  • Slow shut downs lead to 'Firefox is already running' warning (see 966469 and 985655)

  • GNU/Linux and Windows XP: Google Maps Street View displays a black screen (1034593)

  • Mac OS X and Windows: Citrix Receiver no longer works. As a workaround, mark the plugin as Always Enable in the addon manager (1025627)

  • PDF.js: With some fonts, some characters might not be displayed. Affects a very small number of PDF (1028735)