uBO Lite: MV3-based content blocker extension

uBO Lite is a content blocking browser extension designed for the Manifest V3 extension platform. It operates entirely through declarative rules, allowing the browser to handle CSS and JavaScript injection for content filtering without maintaining persistent background processes. The extension uses a service worker architecture that only activates during user interactions with the popup or options pages. It supports multiple filter lists including uBlock Origin's built-in filters, EasyList, EasyPrivacy, and Peter Lowe's server lists, with additional rulesets available through configuration.