Download Mozilla Firefox 39.0

Mozilla has released version 39 of its web browser Firefox. Version 39, among other things, has added the possibility to invite contacts from various social media to a conversation via the Hello communication service, improvements have been made to the display of animations on OS X and downloads on OS X and Linux are now checked for malware. Below is the complete overview of the improvements made in version 39:

New

• Share Hello URLs with social networks
• Project Silk: Smoother animation and scrolling (Mac OS X)
• Support for ‘switch’ role in ARIA 1.1 (web accessibility)
• SafeBrowsing malware detection lookups enabled for downloads (Mac OS X and Linux)
• Support for new Unicode 8.0 skin tone emoji

Changed

• Removed support for secure SSLv3 for network communications
• Disable use of RC4 except for temporarily whitelisted hosts
• The malware detection service for downloads now covers common Mac file types (Bug 1138721)
• Performance of displaying dashed lines is improved (Mac OS X) (Bug 1123019)

HTML5

• List-style-type now accepts a string value
• Enable the fetch API for network requests from dedicated, shared and service workers
• Cascading of CSS transitions and animations now matches the current spec
• implementation allowing anticipation of a future connection without revealing any information
• Added support for CSS Scroll Snap Points

Developer

• Drag and drop enabled for nodes in Inspector markup view
• Web console input history persists even after closing the toolbox
• Cubic bezier tooltip now shows a gallery of timing-function presets for use with CSS animations
• localhost is now available offline for WebSocket connections

Fixed

• Improve performance for IPv6 fallback to IPv4
• Fix incomplete downloads being marked as complete by detecting broken HTTP1.1 transfers
• The Security state indicator on a page now correctly ignores loads caused by previous pages
• Fixed an issue where a Hello conversation window would sometimes fail to open
• A regression that could lead to Flash not displaying has been fixed
• Update to NSS 3.19.2

Security fixes

• 2015-71 NSS incorrectly permits skipping or ServerKeyExchange
• 2015-70 NSS accepts export-length DHE keys with regular DHE cipher suites
• 2015-69 Privilege escalation in PDF.js
• 2015-68 OS X crash reports may contain entered key press information
• 2015-67 Key pinning is ignored when overridable errors are encountered
• 2015-66 Vulnerabilities found through code inspection
• 2015-65 Use-after-free in workers while using XMLHttpRequest
• 2015-64 ECDSA signature validation fails to handle some signatures correctly
• 2015-63 Use-after-free in Content Policy due to microtask execution error
• 2015-62 Out-of-bound read while computing an oscillator rendering range in Web Audio
• 2015-61 Type confusion in Indexed Database Manager
• 2015-60 Local files or privileged URLs in pages can be opened into new tabs
• 2015-59 Miscellaneous memory safety hazards (rv:39.0 / rv:31.8 / rv:38.1)

The following downloads are available:
Mozilla Firefox 39.0 for Windows (English)
Mozilla Firefox 39.0 for Linux (English)
Mozilla Firefox 39.0 for OS X (English)
Mozilla Firefox 39.0 for Windows (English)
Mozilla Firefox 39.0 for Linux (English)
Mozilla Firefox 39.0 for OS X (English)
Mozilla Firefox 39.0 for Windows (Frisian)
Mozilla Firefox 39.0 for Linux (Frisian)
Mozilla Firefox 39.0 for OS X (Frisian)