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Firefox Web site
This official Firefox Web site features user information, documentation, and the downloadable Firefox files.
Created by Netscape Communications, this site provides a focal point for developers who are interested in modifying and redistributing Netscape client source. It includes FAQs, news, information on projects, documentation, and developer information.
Webopedia's "Did You Know..." Reference Section - All About Open Source
Open source usually refers to a program in which the source code is available to the general public for use and/or modification from its original design free of charge. Open source code is typically created as a collaborative effort in which programmers improve upon the code and share the changes within the community.