uBlock Origin (/ˈjuːblɒk/ "you-block") is a free and open-source, cross-platform browser extension for content-filtering, including ad-blocking. The extension is available for several browsers: Chrome, Chromium, Edge, Firefox, Opera, Pale Moon, as well as versions of Safari prior to 13. uBlock Origin has received praise from technology websites and is reported to be much less memory-intensive than other extensions with similar functionality. uBlock Origin's stated purpose is to give users the means to enforce their own (content-filtering) choices.