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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 system requirements of this release.


Firefox for Android 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!


  • Ability to re-order existing panels in browser homescreen

  • Added ability to refresh synced tabs on demand

  • Firefox Hub APIs (learn more, examples)

  • mozilla::pkix as default certificate verifier (learn more)

  • Locales added: Assamese [as], Bengali [bn-IN], Gujarati [gu-IN], Hindi [hi-IN], Kannada [kn], Malayalam [ml], Marathi [mr], Oriya [or], Panjabi [pa-IN], Tamil [ta], Telugu [te]



  • 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.

  • Last release supporting Android 2.2 and ARMv6 chipset - security updates available through January 2015


  • 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

  • navigator.sendBeacon enabled by default (learn more)

Developer Information



  • Does not start on Android L preview (see 1030897)