And just where are you hearing this?. from https://www.mozilla.org/privacy/faq/ <blockquote>It seems like every company on the web is buying and selling my data. You’re probably no different. Mozilla doesn’t sell data about you, and we don’t buy data about you.</blockquote> Also the Firefox web browsers are free to download, install and use and even compile from source yourself so Firefox users are not customers since they did not pay to use.