Mozilla Firefox 39 is a web browser developed by Mozilla Foundation , available for download in full install version for Windows platforms from legacy sources. This version of Firefox was officially released on 2015-07-02 for public access and a brief summary of important updates and change log pertaining to this edition can be read below.

Firefox 39 has been released with changes in user interface, API addition removal and few HTML 5 elements update. In the user interface improvement now users can share hello URLs in social networks directly. For smoother animation scrolling Project Silk has been introduced and it would work in Mac OS X.

In the privacy and security side, now malware detection is enabled for downloads for OS X and Linux editions, though not implemented in Windows editions. Support for SSLV3 has been withdrawn, the protocol Mozilla considers as insecure.

On patch fixes part, false marking of incomplete downloads has been fixed which was happening due to broken HTTP 1.1 transfers. Hello conversations not getting opened randomly got a fix now.