The privacy and security tab has an option to "Allow Firefox to install and run studies" which is checked by default

When I disabled the addon a survey showed up asking me about my firefox experience, using the usual marketing lingo. I answered that I would still consider firefox in the future. But after reading about no. 2 I'm not so sure anymore. All in all a very unpleasant experience.
2. Also firefox started to infect some of their browser downloads with an addon called "cliqz", which is spying on the user - for noble reasons, of course, see https://blog.mozilla.org/press-uk/2017/ ... n-firefox/. Mozilla promises that no individual data will be stored but big data techniques are detrimental in every way even if they concentrate on "big" instead of individual data. I haven't seen this version myself.
I think we should make sure that the browser delivered to our user is not infected with spyware or other troians. If we can't do that we'll have to at least warn the users about it. That's why I'm filing this in the bug section.
I'm not really sure how the addon from no 1 got into our repo. Maybe it got downloaded by firefox after installation? It was there on the first call and there was absolutely no information about it. I just noticed that the search bar vanished and started to investigate.
Maybe it could help to preconfigure dissent to telemetry and studies in about:config via user.js so that our users would need to opt in instead of opting out of something they don't even notice.