BadBlocker Adblock for YouTube MAIN World JS Injection via scripletsRules

Ibrahim Saud@tektrix

•updated Jun 25, 2026•0•0•4

Detects specific malicious Chrome extension IDs executing JavaScript in the 'MAIN' world context of visited web pages. This behavior bypasses the browser extension's isolated execution sandbox by using 'chrome.scripting.executeScript' combined with malicious server-fetched 'scripletsRules' or the 'trusted-create-element' scriptlet, enabling full DOM access and potential credential theft or cross-site scripting.