uBlock Origin Lite (uBOL) is a lightweight, MV3-based content blocker for Firefox that immediately blocks ads, trackers and cryptominers. It’s available for desktop and Firefox for Android, has about 3,050 users and a five-star average from seven reviewers. The extension package is roughly 9.2 MB (version 2026.930.1227) and was updated recently (Sep 30, 2026). Screenshots show a popup panel and dashboard panes for settings, filter lists and custom filters. The listing highlights that it’s aimed at privacy and security, is GPLv3-licensed, and the developer states the extension does not require data collection.
Technically, uBOL ships with a default ruleset matching uBlock Origin’s built-in lists - EasyList, EasyPrivacy and Peter Lowe’s ad/tracking server list - and lets users enable additional lists from the options (via the cog in the popup). Filtering is implemented entirely declaratively so the browser performs CSS/JS injection-based blocking without a continuous extension process; as a result uBOL claims negligible CPU/memory footprint while blocking. A service worker runs only when users interact with the popup or options. Required permission is broad content-blocking on pages, with an optional permission to access site data.
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