uBlock Origin

<p>uBlock Origin  is a free and <a href="/facts/Open_source/7X9rCdz4">open-source</a> <a href="/facts/Browser_extension/jzkeh57V">browser extension</a> for <a href="/facts/Content_filtering/bHoW65eY">content filtering</a>, including <a href="/facts/Ad_blocking/WfmBIxuP">ad blocking</a>. The extension is available for <a href="/facts/Firefox/xez2zv8H">Firefox</a> and <a href="/facts/Chromium_(web_browser)/F1S8sAEt">Chromium</a>-based browsers (such as <a href="/facts/Google_Chrome/4INfWq37">Chrome</a>, <a href="/facts/Microsoft_Edge/BGoJEFX9">Edge</a>, <a href="/facts/Brave_(web_browser)/53jIB9TV">Brave</a>, and <a href="/facts/Opera_(web_browser)/2NYCcTj1">Opera</a>).
</p><p>uBlock Origin is actively developed and maintained by its creator and lead developer Raymond Hill and the open source community. As of April 2025<a href="https://en.wikipedia.org/w/index.php?title=UBlock_Origin&action=edit">[update]</a>, the Chrome version of uBlock Origin had over 29 million active users and the Firefox version had over 9 million active users, making it the most popular extension on Firefox.
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uBlock Origin open-in-new

uBlock Origin