I mean, you linked a press release from 2012 for a partnership with Everything.me, and an Indian Mozilla video from 2014 about adaptive search which doesn't mention anything about that. I'm not saying FF is innocent in data-sharing, but at this point you're spreading FUD around. To make a claim like that, you need something way more definitive!
Edit:
You're right that it's not mentioned in the video. That's part of the problem; it's obviously something people care about and would like to be informed of.