What web browser do you use?

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Personally, I prefer the ease of use of FireFox. I like FireFox because I can change it's settings, thus increasing page load speed. Internet Explorer is extremely slow in loading. What web browser do you use and why? Why would someone benefit from using it? What are the pros and cons of it? Possible Browser Choices: Internet Explorer Mozilla FireFox Apple Safari (?) Opera Any others are welcome, too!