It would inform people better if you would be more precise here.

According to the links, the "Get Add-ons" view in Firefox uses Google Analytics to collect aggregate visitor statistics. Furthermore they note that they negotiated a special contract with Google to only collect a subset of data.

I don't believe any kind of personal or special contracts/negotiations/etc will deny Google to track analytics.google.com connection logs. So, "private browser" and Google servers aren't compatible by design.