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Definition: Firefox is a popular Web browser. Firefox is an open-source project, meaning that the source code is freely available for public contributions, and is maintained by Mozilla. Firefox is compatible with any operating system, and is a free download.

Firefox is probably best known for its tabbed browser feature, its ability to bypass popup ads and other intrusive Web advertisements, and the many Firefox extensions that make this browser even more powerful. Here's more information about Firefox:

"Firefox is my browser of choice; I love the tabs."

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