WHY DO YOU NEED MY DATA TO MAKE FIREFOX WORK???
They don't care about your actual data, they care about how Firefox is used. That's an incredible important piece of information every developer needs to know.
How else do you get to know, what's working right and what doesn't? How do you plan development for the next years if you don't know what to develop?
This is about throwing millions of $ at the right thing. If you miss you are fucked.