BaldProphet

This just means they can use the information you input in order for Firefox to work the way you expect it to. The purpose of the information collection is clearly stated:

to help you navigate, experience, and interact with online content as you indicate with your use of Firefox.

I left Facebook to preserve my mental health. I am never going back.

I use Technitium DNS server on a mini PC to serve the same function as a Pi-Hole, and it works flawlessly.