![]() Pre-fetching, which is 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 decide whether pre-fetching is disabled or not. There is a setting available to tentatively mitigate this issue in Chromium-based browsers (disabled by default), see Suspend network activity until all filter lists are loaded. Reliably blocking at browser launch is especially important for whoever uses default-deny mode for 3rd-party resources and/or JavaScript. tracker/advertisement payloads may find their way into already opened tabs before uBO is up and ready in Chromium-based browsers, while these are properly filtered in Firefox. This is not the case with Chromium-based browsers, i.e. ![]() Browser launchĪt browser launch, Firefox will wait for uBO to be up and ready before network requests are fired from already opened tab(s). 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 it is parsed 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. On the Web" at Asia Pacific Network Information Centre, August 2020. Source: "Characterizing CNAME Cloaking-Based Tracking The dark green/red bars are uBO before/after it gained 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 other browser/blocker pairs: CNAME-uncloakingĪbility to uncloak 3rd-party servers disguised as 1st-party through the use of 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. ![]()
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