Many extensions that you install in Firefox add one or multiple preferences to the browser to control various settings.
Problem is, these preferences are not removed when you uninstall the add-ons again in the browser. If you never clean up the configuration of Firefox, you will end up with a bloated file that contains lots of unused preferences
It's 2022, every browser should have this.
Web browsers collect a massive amount of our web history data. These options can help with that.
A major source of revenue for Mozilla.
