I suppose some clarity would have been nice but I try to err on the side of charitable interpretation with these things, especially with how much MDS there tends to be in the hn comment sections. This does just seem to be like a high level announcement of the overall partnership, though some clarity over local versus cloud would have been nice.
But they do link to a page describing the "smart window" which goes into a bit more detail:
Yes, that's one of the pages I wrote my comment about. I did try to interpret it charitably, but there's nothing on that page (everyone read it! It's short!) that simply communicates to users, "we're uploading your browsing history to the cloud".
It has a number of words circling around the topic, words relating to privacy and local storage; and all of them avoid communicating the main point. Some seem to mislead about it. How, for example, can you say
> "They’re stored on your device, not on Mozilla’s servers,"
And never explain in plain English "...but also we need to upload them to Mozilla's (& Mistral's) servers" at any point in the advert?
The first time I read this page, I myself couldn't figure out if it was about local inference or not; and I was actively looking for the answer. That's how opaque this is.