Google is aggressively locking down the webRequest API. In Manifest V3, extensions can no longer easily block or modify requests synchronously . They must use declarativeNetRequest , which is slower and less flexible.
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function escapeHtml(str) return str.replace(/[&<>]/g, function(m) if (m === '&') return '&'; if (m === '<') return '<'; if (m === '>') return '>'; return m; ); Google is aggressively locking down the webRequest API
// Load and display existing rules function loadRules() chrome.runtime.sendMessage( action: 'getRules' , (response) => if (response && response.rules) displayRules(response.rules); if (m === '<