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Firefox 39.0

  -  73.1 MB  -  Freeware
Free Download

Security Status

Sometimes latest versions of the software can cause issues when installed on older devices or devices running an older version of the operating system.

Software makers usually fix these issues but it can take them some time. What you can do in the meantime is to download and install an older version of Firefox 39.0.


For those interested in downloading the most recent release of Firefox for Mac or reading our review, simply click here.


All old versions distributed on our website are completely virus-free and available for download at no cost.


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If you have any questions or ideas that you want to share with us - head over to our Contact page and let us know. We value your feedback!

Download Firefox 39.0
Why is this app published on FileHorse? (More info)

  • Firefox 39.0 Screenshots

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    Firefox 39.0 Screenshot 1
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  • Firefox 39.0 Screenshot 3
  • Firefox 39.0 Screenshot 4
  • Firefox 39.0 Screenshot 5

What's new in this version:

- New - Share Hello URLs with social networks
- New - Project Silk: Smoother animation and scrolling (Mac OS X)
- New - Support for 'switch' role in ARIA 1.1 (web accessibility)
- New - SafeBrowsing malware detection lookups enabled for downloads (Mac OS X and Linux)
- New - Support for new Unicode 8.0 skin tone emoji
- Changed - Removed support for insecure SSLv3 for network communications
- Changed - Disable use of RC4 except for temporarily whitelisted hosts
- Changed - The malware detection service for downloads now covers common Mac file types (Bug 1138721)
- Changed - Performance of displaying dashed lines is improved (Mac OS X) (Bug 1123019)
- HTML5 - List-style-type now accepts a string value
- HTML5 - Enable the Fetch API for network requests from dedicated, shared and service workers
- HTML5 - Cascading of CSS transitions and animations now matches the current spec
- HTML5 - Implement allowing anticipation of a future connection without revealing any information
- HTML5 - Added support for CSS Scroll Snap Points
- Developer - Drag and drop enabled for nodes in Inspector markup view
- Developer - Webconsole input history persists even after closing the toolbox
- Developer - Cubic bezier tooltip now shows a gallery of timing-function presets for use with CSS animations
- Developer - localhost is now available offline for WebSocket connections
- Fixed - Improve performance for IPv6 fallback to IPv4
- Fixed - Fix incomplete downloads being marked as complete by detecting broken HTTP1.1 transfers
- Fixed - The Security state indicator on a page now correctly ignores loads caused by previous pages
- Fixed - Fixed an issue where a Hello conversation window would sometimes fail to open
- Fixed - A regression that could lead to Flash not displaying has been fixed
- Fixed - Update to NSS 3.19.2
- Fixed - Various security fixes

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