platform/mv3/description/en.md
uBO Lite (uBOL), an efficient MV3 API-based content blocker.
uBOL is entirely declarative, meaning there is no need for a permanent uBOL process for the filtering to occur, and CSS/JS injection-based content filtering is performed reliably by the browser itself rather than by the extension. This means that uBOL itself does not consume CPU/memory resources while content blocking is ongoing -- uBOL's service worker process is required only when you interact with the popup panel or the option pages.
The default ruleset corresponds to at least uBlock Origin's default filterset:
You can add more rulesets by visiting the options page -- click the Cogs icon in the popup panel.