uBlock Origin - An efficient blocker for Chromium and Firefox. Fast and lean. - gorhill/uBlock| GitHub
Download Stylus for Firefox. Redesign your favorite websites with Stylus, an actively developed and community driven userstyles manager. Easily install custom themes from popular online repositories, or create, edit, and manage your own personalized CSS stylesheets.| addons.mozilla.org
Firefox users now have access to Total Cookie Protection by default. Find all you need to know about it in this article.| support.mozilla.org