Firefox Beta Notes

Version 31.0beta, first offered to Beta channel users on June 12, 2014

Check out "What’s New" and "Known Issues" for this version of Firefox below. As always, you’re encouraged to tell us what you think, or file a bug in Bugzilla. If interested, please see the complete list of changes in this release.

What’s New

  • New

    Integration of generational garbage collection

  • New

    Add the search field to the new tab page

  • New

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

  • New

    OdinMonkey: Use backtracking allocator for asm.js style code

  • 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)

  • 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 (learn more)

  • HTML5

    CSS3 variables implemented (learn more)

  • Developer

    Developer Tools: Add-on Debugger (learn more)

  • Developer

    Developer Tools: Canvas Debugger (learn more)

  • Developer

    New Array built-in: Array.prototype.fill() (learn more)

  • Developer

    New Object built-in: Object.setPrototypeOf() (learn more)

  • Developer

    CSP 1.1 nonce-source and hash-source enabled by default

  • Developer

    Developer Tools: Eyedropper tool added to the color picker (learn more)

  • Developer

    Developer Tools: Editable Box Model (learn more)

  • Developer

    Developer Tools: Code Editor improvements (learn more)

  • Developer

    Developer Tools: Console stack traces (learn more)

  • Developer

    Developer Tools: Copy as cURL (learn more)

  • Developer

    Developer Tools: Styled console logs (learn more)

  • Developer

    navigator.sendBeacon enabled by default (learn more)

  • 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 (985824)

Known Issues

  • unresolved

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

  • unresolved

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

    Resolved in v31.0a2

  • unresolved

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

  • unresolved

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

    Resolved in v32.0a2

  • unresolved

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

    Resolved in v32.0a2