![]() ![]() Reference: Disable prefetching WebAssembly Pre-fetching, disabled by default in uBO, is reliably prevented in Firefox, while this is not the case in Chromium-based browsers.Ĭhromium-based browsers give precedence to websites over user settings when it comes to deciding whether pre-fetching is disabled or not. This setting does not cover 100% of all use cases, and some exceptions may apply. Reliably blocking at browser launch is especially important for whoever uses default-deny mode for 3rd-party resources or JavaScript.Ī setting is available, disabled by default, to mitigate this issue in Chromium-based browsers. ![]() Tracker/advertisement payloads may find their way into already opened tabs before uBO is ready, while Firefox will properly filter these. In Chromium-based browsers, this is not the case. Browser launchįirefox will wait for uBO to be ready before sending network requests from already opened tab(s) at browser launch. This feature requires the webRequest.filterResponseData() API, currently only available in Firefox. HTML filtering is the ability to filter the response body of HTML documents before parsing them by the browser.įor example, this allows the removal of specific tags in HTML documents before they are parsed and executed by the browser, something not possible in a reliable manner in other browsers. Source: "Characterizing CNAME Cloaking-Based Tracking on the Web" at Asia Pacific Network Information Centre, August 2020. The dark green/red bars are uBO before/after it gained the ability to uncloak CNAMEs on Firefox. The effect of this is to make uBO on Firefox the most efficient at blocking 3rd-party trackers relative to other browser/blocker pairs: CNAME-uncloakingĪbility to uncloak 3rd-party servers disguised as 1st-party through CNAME record. This document explains why uBO works best in Firefox. Read carefully if using uBO/webext on legacy Firefox.The removed element reappears when you reload the page.Software known to have uninstalled uBlock Origin.Doesn't uBlock Origin add overhead to page load?.Does uBlock Origin block ads or just hide them?.Overview of uBlock's network filtering engine: details.Overview of uBlock's network filtering engine.Medium mode (optimal for advanced users). ![]()
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