Fox

Mozilla Firefox (known simply as Firefox) is a free and open-source[20] web brow
ser developed for Windows, OS X, and Linux, with a mobile version for Android, b
y the Mozilla Foundation and its subsidiary, the Mozilla Corporation. Firefox us
es the Gecko layout engine to render web pages, which implements current and ant
icipated web standards.[21]
As of February 2014, Firefox has between 12% and 22% of worldwide usage, making
it, per different sources, the third most popular web browser.[22][23][24][25] A
ccording to Mozilla, Firefox counts over 450 million users around the world.[26]
The browser has had particular success in Indonesia, Iran, Germany, and Poland,
where it is the most popular browser with 55%,[27] 46%,[28] 43%,[29] and 41%[30
] of the market share, respectively