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Firefox - Fully Open Source, or not?

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  • Èsì tí ó kẹ́hìn lọ́wọ́ TyDraniu

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Simple question, is Firefox fully opensource? I always heared it is opensource, but is that a 100%? If not, which part of the sourcecode is kept private, and why?

Simple question, is Firefox fully opensource? I always heared it is opensource, but is that a 100%? If not, which part of the sourcecode is kept private, and why?

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Yes, it's fully open source, except the Google DRM plugin. You can download build without DRM part.