“The reason we’ve stepped away from making blanket claims that ‘We never sell your data’ is because, in some places, the LEGAL definition of ‘sale of data’ is broad and evolving.”
Mozilla deleted its promise never to sell your data. It now says it does not sell data in the way most people think about selling data. Firefox’s first terms of use still claim a worldwide license to what you type into it. Mozilla needs the ad money and stopped pretending otherwise.