uBO Lite (uBOL) is a unique content blocker that operates without the need for any permissions. It uses the same filters as uBlock Origin, including EasyList and EasyPrivacy. Additional rulesets can be added through the options page. Unlike other blockers, uBOL relies on the browser itself for content filtering, which means it doesn’t consume CPU/memory resources during blocking. However, it offers the ability to grant extended permissions on specific sites for more effective filtering. This can be done by selecting a higher filtering mode in the popup panel and accepting the browser’s warning. While still a work in progress, uBOL aims to be reliable, efficient, and user-controlled.
https://addons.mozilla.org/en-US/firefox/addon/ublock-origin-lite/