It's not anonymized, because your communication with Mozilla has plenty of identifying information.
replyAlso, Mozilla officially un-committed to not using sell this and any other data it collects from you:
https://arstechnica.com/tech-policy/2025/02/firefox-deletes-...
That article is well over a year old. The current privacy FAQ right now explicitly states:
reply> We never sell your personal data. Unlike other big tech companies that collect and profit off your personal information, we’re built with privacy as the default. We don’t know your age, gender, precise location, or other information Big Tech collects and profits from.