1. Ublock Origin - hands down by far the best extension ever
2. LocalCDNs - substituting previous DecentralEyes
3. Cookie AutoDelete
4. ClearURLs
5. CanvasBlocker
6. Temporary Containers - leverages firefox containers in an automated way (if you enable it),in my setup, to open every page in a new domain into a separate container

Used to use: . PrivacyBadger - redundant with ublock on expert mode and 3rd party requests blocked . DecentralEyes - same as LocalCDNs but supposely with less content to substitute . HTTPS Everywhere - redundant with new settings in firefox . NoSricpt - with uBlock in expert block and blocking javascript by default i have all the granularity i need . uMatrix - same as above

also, use the best (for privacy/digital hygiene) firefox forks: Librewolf on desktop, Mull on android