I don’t understand how they are supposed to “sell your data” if you just never use a Mozilla account and uncheck all the telemetry. Its not like they can secretly steal your data, since its Open Source.
It seems to me like just more FUD that Google is spreading to undermine our trust in free software.
There are truly open llm, there are somewhat open. If you are asking about firefox translate, it seems that models themselves weren’t trained by mozilla.