Mozilla Firefox
Mozilla Firefox
Mozilla Firefox is a free and open source web browser developed for Windows, OS X, and Linux, with a mobile version for Android, by Mozilla Foundation and its subsidiary, the Mozilla Corporation. Firefox uses the Gecko layout engine to render web pages, which implements current and anticipated web standards.

As of July 2013, Firefox has between 16% and 21% of worldwide usage, making it the third most popular web browser, according to different sources. According to Mozilla, Firefox counts over 450 million users around the world. The browser has had particular success in Indonesia, Germany, and Poland, where it is the most popular browser with 57%, 45% and 44% of the market share, respectively.
Reference
Wikipedia
Web Browsers
Google Chrome
Internet Explorer
Mozilla Firefox
Opera Browser
Safari