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diff --git a/dom/security/test/general/test_nosniff.html b/dom/security/test/general/test_nosniff.html
new file mode 100644
index 000000000..197251e68
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+++ b/dom/security/test/general/test_nosniff.html
@@ -0,0 +1,118 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 471020 - Add X-Content-Type-Options: nosniff support to Firefox</title>
+  <!-- Including SimpleTest.js so we can use waitForExplicitFinish !-->
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+
+  <!-- add the two css tests -->
+  <link rel="stylesheet" id="cssCorrectType">
+  <link rel="stylesheet" id="cssWrongType">
+</head>
+<body>
+
+<!-- add the two script tests -->
+<script id="scriptCorrectType"></script>
+<script id="scriptWrongType"></script>
+
+<!-- add the two img tests -->
+<img id="imgCorrectType" />
+<img id="imgWrongType" />
+
+<script class="testbody" type="text/javascript">
+/* Description of the test:
+ * We load 2 css files, 2 script files and 2 image files, where
+ * the sever either responds with the right mime type or
+ * the wrong mime type for each test.
+ */
+
+SimpleTest.waitForExplicitFinish();
+const NUM_TESTS = 6;
+
+var testCounter = 0;
+function checkFinish() {
+	testCounter++;
+	if (testCounter === NUM_TESTS) {
+		SimpleTest.finish();
+	}
+}
+
+SpecialPowers.pushPrefEnv({set: [["security.xcto_nosniff_block_images", true]]}, function() {
+
+  // 1) Test CSS with correct mime type
+  var cssCorrectType = document.getElementById("cssCorrectType");
+  cssCorrectType.onload = function() {
+    ok(true, "style nosniff correct type should load");
+    checkFinish();
+  }
+  cssCorrectType.onerror = function() {
+    ok(false, "style nosniff correct type should load");
+    checkFinish();
+  }
+  cssCorrectType.href = "file_nosniff_testserver.sjs?cssCorrectType";
+
+  // 2) Test CSS with wrong mime type
+  var cssWrongType = document.getElementById("cssWrongType");
+  cssWrongType.onload = function() {
+    ok(false, "style nosniff wrong type should not load");
+    checkFinish();
+  }
+  cssWrongType.onerror = function() {
+    ok(true, "style nosniff wrong type should not load");
+    checkFinish();
+  }
+  cssWrongType.href = "file_nosniff_testserver.sjs?cssWrongType";
+
+  // 3) Test SCRIPT with correct mime type
+  var scriptCorrectType = document.getElementById("scriptCorrectType");
+  scriptCorrectType.onload = function() {
+    ok(true, "script nosniff correct type should load");
+    checkFinish();
+  }
+  scriptCorrectType.onerror = function() {
+    ok(false, "script nosniff correct type should load");
+    checkFinish();
+  }
+  scriptCorrectType.src = "file_nosniff_testserver.sjs?scriptCorrectType";
+
+  // 4) Test SCRIPT with wrong mime type
+  var scriptWrongType = document.getElementById("scriptWrongType");
+  scriptWrongType.onload = function() {
+    ok(false, "script nosniff wrong type should not load");
+    checkFinish();
+  }
+  scriptWrongType.onerror = function() {
+    ok(true, "script nosniff wrong type should not load");
+    checkFinish();
+  }
+  scriptWrongType.src = "file_nosniff_testserver.sjs?scriptWrongType";
+
+  // 5) Test IMG with correct mime type
+  var imgCorrectType = document.getElementById("imgCorrectType");
+  imgCorrectType.onload = function() {
+    ok(true, "img nosniff correct type should load");
+    checkFinish();
+  }
+  imgCorrectType.onerror = function() {
+    ok(false, "img nosniff correct type should load");
+    checkFinish();
+  }
+  imgCorrectType.src = "file_nosniff_testserver.sjs?imgCorrectType";
+
+  // 6) Test IMG with wrong mime type
+  var imgWrongType = document.getElementById("imgWrongType");
+  imgWrongType.onload = function() {
+    ok(false, "img nosniff wrong type should not load");
+    checkFinish();
+  }
+  imgWrongType.onerror = function() {
+    ok(true, "img nosniff wrong type should not load");
+    checkFinish();
+  }
+  imgWrongType.src = "file_nosniff_testserver.sjs?imgWrongType";
+});
+
+</script>
+</body>
+</html>