These are the five essential privacy extensions for the Firefox web browser. They complement each other well, and work silently in the background:
uBlock Original and Privcy Badger
uBlock Origin and Privacy Badger are the best advertising blockers available. They also block invisible web trackers. When both are installed, Privacy Badger will catch some trackers that uBlock Origin misses.
Cookie Autodelete will automatically delete cookies when a browser tab closes. You can whitelist the ones you trust while deleting the rest. A wonderful solution to tracking cookies.
HTTPS Everywhere is an extension that ensures you always visit the secure version of a website, if it is available.
Decentraleyes is an extension avoids tracking by creating local versions of hosted libraries. It prevents a lot of requests from reaching networks like Google Hosted Libraries. Thus it helps to reduce your network load.