all of the telemetry in Firefox is easily disabled so the issue you refer to is really a non-issue admittedly Firefox is not an ideal browser and the parent company, Mozilla, is [fucked](https://12bytes.org/articles/tech/the-mozilla-monster/), however the developers working on Firefox are very privacy oriented - an example of this is the [Tor uplift project](https://wiki.mozilla.org/Security/Tor_Uplift) which is a process of incorporating in Firefox the privacy advantages of the Tor browser which is a modified version of Firefox at this time Firefox is the best suited, well rounded browser for security and privacy hardening in my considered opinion if you want to know how to configure it for better privacy see [one of my extensive guides](https://12bytes.org/articles/tech/firefox/)