A wide-spectrum efficient blocker. Which block ads, trackers and malware sites. Supports Chromium, Chrome, Edge, Firefox, Opera, Safari, Thunderbird. Fast and lean, and as of 2017 still being actively improved. Forked from uBlock uBlock Origin has received praise from technology websites, and is reported to be much less memory-intensive than other extensions Manifesto • The user decides what web content is acceptable or not in their browser.