I'm of the opinion that local inference should be done to the greatest extent that is realistically possible, at the earlier time that the hardware/average user platform is capable of doing so. I personally spend a fair bit on kWh extra in my home electrical bill monthly for having a good sized chunk of local inference ability in my house, but that's not a common thing yet.

If mozilla is doing things to send users down the path of doing this externally, they need to be much more upfront and transparent with the users about where their data is going, and not bury it in some terms/conditions that only nerds will hunt for.