765
Mozilla is already revising its new Firefox terms to clarify how it handles user data
(www.theverge.com)
This is a most excellent place for technology news and articles.
Yes, this is built from Mozilla's sources, but AFAIK Mozilla doesn't maintain this build script, and the build script strips out certain parts of Firefox and adds in others (e.g. logo). It's not a fork of Firefox, it's just a builder that replaces parts of Firefox.
So Mozilla doesn't maintain Fennec, since Fennec is a separate build of Firefox, but they do maintain what Fennec is built from.