Add-Ons I have installed are:

• uBlock Origin
• uMatrix (sadly deprecated)
• Privacy Badger, shows/blocks trackers that made it through uBlock/uMatrix (which are not many if at all)
• Decentraleyes, which caches libraries from CDNs so you don’t connect to these central servers again, disclosing your usage pattern
• Cookie AutoDelete, mostly optional but clears cookies while browser is running and not only on close
• DarkReader, so bright pages go dark
• Sidebery, for organizing tabs (I miss true tab groups in Firefox, but only a bit)