Contact their support since this is their software your using.

https://support.mozilla.org/en-US/kb/firefox-protection-against-fingerprinting

Contact their support since this is their software your using.

You sure you understood the question?

The web site Eff.org is a respectable site and when I use other web browsers i receive answers like "your web browser has a randomized fingerprint"

Can you recommend a fingerprint test ?

This s a very difficult issue to combat. One approach is to use a custom Firefox user.js like Arkenfox: https://github.com/arkenfox/user.js/ . You can try the Firefox-based Mullvad Browser and Tor Browser for more effective protection against fingerprinting.

You are aware that other browsers get a better fingerprint result. What does the FF privacy value called "Known and suspected fingerprinters" perform or protect against ?