You might want to keep looking for better friends. Firefox recently got busted tracking users without their consent

https://noyb.eu/en/firefox-tracks-you-privacy-preserving-feature

With a recent Firefox update, Mozilla seems to have taken a leaf out of Google’s playbook: without directly telling its users, the company has secretly enabled a so-called “Privacy Preserving Attribution” (PPA) feature. Similar to Google’s (failed) Privacy Sandbox, this turned the browser into a tracking tool for websites.

Edit: i am not saying that Firefox is bad. I just wouldn’t call it a friend, let alone a best friend