FireX Proxy extension.
Protects you against tracking through "free", centralized, content delivery. It prevents a lot of requests from reaching networks like Google Hosted Libraries, and serves local files to keep sites from breaking. Complements regular content blockers.
View source code of Firefox addons and Chrome extensions (crx/nex/xpi) from addons.mozilla.org, the Chrome Webstore and elsewhere.
Best Popup Blocker in the world. (Best in Rating, Performance, This addon does NOT track user activities same as others) If your Firefox version is 57+ please install Web Extension versions otherwise install older versions from version history.
Blocks cryptocurrency miners all over the web.
This extension collects political ads on facebook.
An addon to manage cookies (view, search, create, edit, remove, backup, restore, protect from deletion). Firefox 57+ is supported.
Kimetrak (Who's tracking me) is an extension allowing you see at a glance what third-party domains are loaded from websites you visit. You can access detailled statistics with a list allowing you to analyse what services are able to track you online.