> Waterfox does not collect ANY telemetry, meaning you don't have to worry about any tracking or usage information about what you do inside YOUR browser. This is woefully uninformed or malicious. There's a lot of tracking that is out of your hands. Such as canvas fingerprinting. Even sending back 0's (like tor does) doesn't prevent fingerprinting. In either case I lost confidence for the browser just by reading what…
It's not worded precisely, but I believe what they have in mind is tracking performed without prior consent by the browser author. Obviously if you don't block tracking scripts that doesn't protect you from websites that want to track you, but that's not the point of the statement.
That was my interpretation. If I tell someone "I'm not collecting any data on you, so you don't have to worry about being tracked", it would be odd for them to accuse me of lying or being incompetent since obviously the government is tracking them.