Yeah I think the "you" in "help you navigate [...]" is the key but it is way too broad. I had a quick look to the privacy notice and it seems quite reasonable. For each feature they either :

• process data locally (eg. for translations)
• anonymise it before sending it to partners (eg. affiliated searches 💩)
• store a minimal amount of information (eg. for FF account)

There is a paragraph about partners being legally binded to comply to their privacy policy, I guess this is about cloud providers? 🤷

So I hope they'll take the time to clarify that...