Indeed, thanks for the mention because I wanted to go back on this. I wouldn’t quality any of this as evidence of Sync sharing usage data. Everything else is still correct, i.e defaulting to Google as search engine, some analytics, etc but it’s still unrelated to Sync. I don’t see how other browsers are relevant. It looks like they and OP are trying to show that Mozilla is not perfect, that they make money and share some private data and thus assume that any data used on any Mozilla product is shared with 3rd parties, including Alphabet, without providing any evidence for that. I’m not sure arguing more will help.