I have a window XP in my computer i am planning to install one of the life time running web browser.

Which should be the best working browser now-a-days which support every type of valid extension file in my computer.

I have three options Internet Explorer, Chrome, Firefox.

Which one is best one.

Firefox. Opera has a few issues, for some css stuff it's even worse than IE! In Firefox everything works, and you can improve it with add-ons and themes. It's safer and more stable, that's the one to use.

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Opera supports nearly all Web Standard that others don't. For a solid browser you can go for Internet Explorer 8 or 9. So it's your choice.