Mozilla Firefox 40 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 2015-08-11 for public access and a brief summary of important updates and change log pertaining to this edition can be read below.

Firefox reached a milestone with launching of version 40 as now Windows 10 users can use their favorite browser. Among other security fixes now users receives protection against unwanted downloads which is a setback for unethical web designers who try to intrude the user system through downloadable malware files.

In the user interface improvements now users can add link to conversations in hello, which can quickly display the context. GUI interface provided for blacklist mechanism which can specify the number of devices being blocked.

In the extensions library side Add-on manager now gets new style based on in-content preferences. Users get a warning if an extension is not authenticated by Mozilla. In the performance improvement area, JPEG images tend to use less memory improving overall performance and can be painted faster.

There are few known bugs remain unfixed in this version like starting in offline mode and progressing downloads will be cancelled with out warning after an add-on restarted the browser.