Many modern websites integrate third-party content from all over the web. Visible examples include embedded Google maps, Disqus comments, Facebook "like" buttons, and advertising. Online user tracking also works this way, but can be much harder to spot. uBlock Origin is a general-purpose content filter. It permits users to decide which third-party content they wish to allow on their computer. In Basic mode, uBlock Origin filters out common advertising, tracking, and known malware. In Advance mode, users can create their own global and site-specific filtering rules. The uBlock Origin team describes this mode as a "point and click firewall which can be configured on a per-site basis." Despite this flexibility, uBlock Origin requires fewer resources than other, similar filtering extensions. uBlock Origin is available for Chrome, Firefox, Safari, and Microsoft Edge.