Mozilla Firefox 51 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 2017-01-24 for public access and a brief summary of important updates and change log pertaining to this edition can be read below.

Firefox 51 edition is released with updated Network Security Services version NSS 3.28.1 and content rendering in linux is being performed using SKIA 2D graphics library.

This edition has also added new functionalities including adding zoom button in URL Bar, ability to view passwords while prompting for password saving, and performing password saving in webpages which does not have submit events.

In the Multimedia segment support for FLAC and WEB GL2 enables the user to play lossless audios and advanced graphics rendering. The developers admit that systems using Enterprise antivirus Software WebSense has noticed crashing of Firefox, but there is a solution provided by Mozilla.