Download Mozilla Firefox 31.0 Beta

As we are used to from Mozilla, the first beta release of the next version has already appeared shortly after the release of a stable version of the Firefox web browser. In version 31, which if all goes well will be available on July 22, Firefox will be able to open .ogg audio and video files, and PDF documents in Windows, among other things. In addition, new tabs have a search field. Below is an incomplete overview of the improvements that we can expect in version 31.

New:

• Add the search field to the new tab page
• Integration of Generational Garbage Collection
• OdinMonkey: Use backtracking allocator for asm.js style code
• mozilla::pkix as default certificate verifier
• audio/video .ogg and .pdf files handled by Firefox if no application specified (Windows only)
• Partial implementation of the OpenType MATH table (section 6.3.6) see documentation about mathematical fonts and the MathML Torture Test for details

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)
• CSS3 variables implemented

Developer

• navigator.sendBeacon enabled by default
• 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
• Dialogs spawned from the unforeunload event no longer block access to the rest of the browser
• 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)
• Developer Tools: Add-on Debugger (learn more)
• Developer Tools: Canvas Debugger (learn more)

Fixed

• Search for partially selected link text from context menu (985824)

Known Issues

• Mac OS X: cmd-L no longer opens a new window when no window is available (1008793). Resolved in v32.0a2
• Without affecting security, after restoring your session, Extended Validation Certificates might not display (See 995801). Resolved in v31.0a2
• Slow shut downs lead to ‘Firefox is already running’ warning (see 966469 and 985655)

The following downloads are available:
Mozilla Firefox 31.0 beta for Windows (English)
Mozilla Firefox 31.0 beta for Linux (English)
Mozilla Firefox 31.0 beta for OS X (English)
Mozilla Firefox 31.0 Beta for Windows (English)
Mozilla Firefox 31.0 Beta for Linux (English)
Mozilla Firefox 31.0 Beta for OS X (English)
Mozilla Firefox 31.0 beta for Windows (Frisian)
Mozilla Firefox 31.0 beta for Linux (Frisian)
Mozilla Firefox 31.0 beta for OS X (Frisian)