Mozilla Firefox is a free and open source Web browser created for Microsoft Windows, OS X, and Linux, harmonized by Mozilla Corporation and Mozilla Foundation. Firefox utilizes the Gecko layout engine to provide Web pages, which implements present and projected Web standards. The Multiple Network Graphic is stored in files with MNG format and is attach with MNG file extension and is utilized as format for graphic images animation. These are normally categorized as raster image files that symbolized PNG for Web animation. These files substituted GIF animations and make use of either lousy or lossless data compression, having the basic structure and portion as the PNG format but with a extra compound signature and larger range of portions used for animation. They contain bitmap indexed colors works in animations, slide shows, or complex still frames, composed of multiple PNG or JPEG Network Graphic (JNG) single-image data streams like PNG. The first version MNG 1.0 was introduced on Jan 31, 2001 and some of its known supporters are Gwenview, Mozilla, Netscape, Sony Ericsson and Sphere game engine.