Sorry, ironically I didn't mean to imply openness in any legal sense (although the foundation itself is publicly accountable in terms of what they spend their money on).
Open companies was probably a bad term to use because it might imply something beyond most/all(?) of their products being developed in the open, but I think the point stands well enough regardless.
I won't edit now, but please read my original "open" as "open source".
Mozilla make open source, they're not open like a publicly accountable body, are they?