Firefox is open source, and even the telemetry server code is on github, so if you wanted to really dig in you could.
At the end of the day if you want Firefox to make rational decisions about what feature to implement they need to collect some data. That fact alone can't be a problem for anyone who wants to have firefox be a competitive browser.
At the end of the day if you want Firefox to make rational decisions about what feature to implement they need to collect some data. That fact alone can't be a problem for anyone who wants to have firefox be a competitive browser.