diff --git a/dom/media/test/mochitest.ini b/dom/media/test/mochitest.ini
index 7f57661c3100..867686d3586b 100644
--- a/dom/media/test/mochitest.ini
+++ b/dom/media/test/mochitest.ini
@@ -861,6 +861,9 @@ scheme=https
 [test_eme_setMediaKeys_before_attach_MediaSource.html]
 skip-if = toolkit == 'android' # bug 1149374
 scheme=https
+[test_eme_special_key_system.html]
+skip-if = toolkit == 'android' # bug 1149374
+scheme=https
 [test_eme_stream_capture_blocked_case1.html]
 tags=mtg capturestream
 skip-if = toolkit == 'android' # bug 1149374
diff --git a/dom/media/test/test_eme_special_key_system.html b/dom/media/test/test_eme_special_key_system.html
new file mode 100644
index 000000000000..bfd3819c72ca
--- /dev/null
+++ b/dom/media/test/test_eme_special_key_system.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title>Test Encrypted Media Extensions - Special key system</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+// Tests that org.mozilla.clearkey_with_protection_query cannot be accessed from JS if not preffed on.
+add_task(async function protectionQueryKeySystemShouldBeHidden() {
+  const kKeySystemOptions = [
+    {
+      initDataTypes: ["cenc"],
+      videoCapabilities: [{ contentType: 'video/mp4; codecs="avc1.4d4015"' }],
+    },
+  ];
+  const kClearKeyWithProtectionQuery =
+    "org.mozilla.clearkey_with_protection_query";
+
+  try {
+    // Should throw since special key systems are not enabled.
+    await navigator.requestMediaKeySystemAccess(
+      kClearKeyWithProtectionQuery,
+      kKeySystemOptions
+    );
+    ok(
+      false,
+      "Test should have thrown by default because media.clearkey.test-key-systems.enabled should not be set"
+    );
+  } catch (e) {
+    is(e.name, "NotSupportedError", "Should get not supported error");
+    is(
+      e.message,
+      "Key system is unsupported",
+      "Should get message that key system is unsupported"
+    );
+  }
+});
+</script>
+</pre>
+</body>
+</html>
