That still doesn't disable all telemetry from being sent. There's a whole slue of settings that you need to change in about:config and then there's still no guarantee.
Even if you follow those steps you listed there and uncheck all those boxes you're shown in the standard settings pages, then Firefox will just continue to send out 'pings' when you interact with certain elements in the browser interface. And that's just the tip of the iceberg.
Mozilla is like one of those politicians that just won't stop yapping about traditional conservative family values, who is later found to have several extramarital children and numerous affairs with same-sex partners themselves.
Even if you follow those steps you listed there and uncheck all those boxes you're shown in the standard settings pages, then Firefox will just continue to send out 'pings' when you interact with certain elements in the browser interface. And that's just the tip of the iceberg.
Mozilla is like one of those politicians that just won't stop yapping about traditional conservative family values, who is later found to have several extramarital children and numerous affairs with same-sex partners themselves.