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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.

31.0a2

Firefox Aurora

May 2, 2014

Version 31.0a2, first offered to Aurora channel users on May 2, 2014

New

  • Integration of generational garbage collection

  • Add the search field to the new tab page

  • OdinMonkey: Use backtracking allocator for asm.js style code

  • mozilla::pkix as default certificate verifier (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)

Developer

  • 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)

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

Developer Information

HTML5

  • Without affecting security, after restoring your session, Extended Validation Certificates might not display (See 995801)

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)

  • Exit is not always completed when "clear history when Firefox closes" is enabled (1005487)