An efficient ad blocker for Chromium and Firefox. Fast and lean.
uBlock Origin is NOT only an “ad blocker”: it is a wide-spectrum blocker — which happens to be able to function as a mere “ad blocker”. The default behavior of uBlock Origin when newly installed is to block ads, trackers and malware sites through EasyList, EasyPrivacy, Peter Lowe’s ad/tracking/malware servers, various lists of malware sites, and uBlock Origin’s own filter lists.
It blocks ads through its support of the Adblock Plus filter syntax. It extends the syntax and is designed to work with custom rules and filters. Furthermore, advanced mode allows uBlock Origin to work in default-deny mode, which mode will cause all 3rd-party network requests to be blocked by default, unless allowed by the user.
An efficient blocker: easy on memory and CPU footprint, and yet can load and enforce thousands more filters than other popular blockers out there. Flexible, it’s more than an “ad blocker”: it can also read and create filters from hosts files.
Out of the box, these lists of filters are loaded and enforced: