What happens when you launch a fresh install of Firefox?

Why this? Is it too difficult to just set up Piwik or something org-wide?

We are looking into GA being used on the privacy page that is shown during first-run.

As for Mozilla's use of GA in general: I'm going from memory here, as this discussion happened via an ephemeral medium, so unfortunately I don't have any logs or notes to check. The people in charge of this evaluation did in fact look into self-hosted analytics services such as Piwik and concluded that they were not capable of meeting our needs. That discussion did not really go into depth about how that conclusion was arrived at, but it was.

Instead, the decision was made to go with GA. As part of the deal, Mozilla asked Google to prevent GA data collected from Mozilla's GA instance from being shared with the rest of Google. In fact, that opt-out has since been made available to all GA customers with enterprise contracts.

Any chance Mozilla adopt similar practice or are there non-obvious downsides to this?

There is currently some discussion about this. I think one of the biggest hurdles will simply be scalability. It's much easier for Brave to do this at their current scale than it is for us.

EDIT: Also, we're wondering whether the SafeBrowsing APIs we use would work across a proxy.

As a bonus, here is a description of how SafeBrowsing works in Firefox.

My thoughts on this are... complex, but I'll try to answer your question from within the context of Google's internal bickering and the current political climate:

Mozilla has the advantage of having already fought these internal battles long ago. In 2012, a Mozillian posted a blog post opposed to marriage equality. This post was picked up and syndicated by Planet Mozilla, which is an official RSS feed that aggregates blog posts from across the Mozilla community. The internal controversy surrounding this led to the development of our Community Participation Guidelines, the TL;DR of which is (more or less): "Believe what you want, but when it comes to your Mozilla activities, you leave it at the door."

By the time we reached 2014 and the Brendan Eich fiasco [Note: the link I provided is to the least inaccurate media account of what actually happened], IMHO us employees of the Mozilla Corporation felt more under siege from external forces than internal ones (The press did report on some "Mozilla employees" who were upset about Eich's appointment as CEO of MoCo, but the ones who were quoted were all employees of the Foundation, not the Corporation, and thus were not even subject to working under Eich in the org chart).

So now we get to today. I don't want to give the impression that everything is 100% harmonious, but those events from the past have positioned us well to stay mostly focused on furthering the Mozilla mission. I'm not saying that issues never come up, but for the most part I would say that everybody understands their responsibilities.

We're also lucky that we have an altruistic mission that guides us, so we don't need to worry about our employer becoming a defense contractor or helping governments to spy on their own people.

EDIT: Fixed incorrect cnet link

As @Wes mentioned, our telemetry respects privacy out of the box.

Unfortunately "telemetry" has become a bit of a loaded term that some people have used to imply (in the context of browser telemetry, at least) that the browser is phoning home with personally-identifiable information (PII) and information about user browsing activity. With the default telemetry settings that Firefox runs out of the box, that couldn't be further from the truth.

Properly-anonymized tracking can still respect your privacy.

Part of these URLs are accessed by a web page that Firefox opens only once after a new profile is created (which is in most cases only once after installation).

It should be possible for someone to make a Firefox extension which listens for touch events and then emits events that the game is watching for.

I don't know, sorry.

You could probably use a Bluetooth mouse or a USB otg cable to plug a USB one into your phone. Android supports pointing devices like mice and tablets as well as touch.