Firefox is very judicious about collecting data. https://wiki.mozilla.org/Telemetry/FAQ https://wiki.mozilla.org/Telemetry/FAQ It collects things like "how sl

Firefox is very judicious about collecting data. https://wiki.mozilla.org/Telemetry/FAQ https://wiki.mozilla.org/Telemetry/FAQ It collects things like "how slow is rendering" or "do you use feature X?". It's all anonymized, and you can verify this from the source (you can also turn it off). Folks are very careful if adding new telemetry metrics. This isn't trackable data.