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<html>
<head>
<script>
function sendMessage() { alert(getComputedStyle(document.querySelector(".hidden")).display == "none" ? "content blockers enabled" :"content blockers disabled"); }
</script>
</head>
<body onload="sendMessage()">
<p class="hidden">
This text exists to determine if content blockers are enabled.
If they're enabled, the computed style of this text will be display:none.
</p>
</body>
</html>
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