The Mozilla Foundation restricts distribution of packages with their trademarks. See the following URLs: http://www.mozilla.org/foundation/trademarks/ http://www.mozilla.org/foundation/trademarks/distribution-policy.html http://www.mozilla.org/foundation/trademarks/faq.html If you want a 100% free and redistributable package, you can disable the official-mozilla-branding option to get a non-trademarked build.