Help me pick a user.js

Hi! I think I might need some help with choosing the right user.js. I want to try switching from Safari because it lacks support for extensions I want to use like Ublock Origin. But telemetry and bloatware prevented me from doing the switch. Is there a user.js that is configured to prevent Firefox from making unnecessary connections to Mozilla and Google, but wouldn't change much in browsing experience (enabling letterboxing, masking PPI)? I thought trying something like maybe pullyukko's relaxed …

doing extensions firefox making origin privacy safari support switch telemetry try ublock ublock origin