To echo @technocrit@lemmy.dbzer0.com, you should give LibreWolf a look. It's based on Firefox, but with the telemetry disabled and the default settings set in a way that best protects your privacy.

One adjustment I faced when switching to it was that, by default, LibreWolf deletes all cookies upon exiting, which was annoying for sites I want to stay logged into (e.g. my email). But you can either turn that off, or click on the lock icon in the address bar and tell LibreWolf to save cookies for that site, which is what I did- and WOW DO I LOVE IT! Bonus perk is that it breaks nag windows on sites that keep track of how many articles you've read.