A global average of 11.5% Internet surfers are using the Firefox open source Web browser, an all time high for Mozilla. The United States is home to the biggest fanbase of the Firefox browser, with some 14.1% using it when they surf.

One Stat gathered the data, questioning some 2 million people overall. The global average of Firefox users has increased by 3% since April this year. The increase has caused a decrease in IE, Opera and Netscape.

However, the userbase of Apple's Safari web browser is growing.

Source
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