All Mozilla software is open source. This means that it is not only available for download free of charge, but you have access to the source code and may modify and redistribute our software subject to certain restrictions as detailed in our license agreements.
Although our code is free, it is very important that we strictly enforce our trademark rights, in order to keep them valid. Our trademarks include, among others, the names Mozilla®, mozilla.org®, Firefox®, Thunderbird™, Bugzilla™, Camino®, Sunbird®, SeaMonkey®, and XUL™, as well as the Mozilla logo, Firefox logo, Thunderbird logo and the red lizard logo. (The full list is in the Mozilla Trademark Policy.) This means that, while you have considerable freedom to redistribute and modify our software, there are tight restrictions on your ability to use the Mozilla names and logos in ways which fall in the domain of trademark law, even when built into binaries that we provide.
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