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diff --git a/image/test/mochitest/test_bullet_animation.html b/image/test/mochitest/test_bullet_animation.html
new file mode 100644
index 0000000000..7e39898a4f
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+++ b/image/test/mochitest/test_bullet_animation.html
@@ -0,0 +1,59 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=666446
+-->
+<head>
+  <title>Test for Bug 666446 - Animated Bullets</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/WindowSnapshot.js"></script>
+  <script type="application/javascript" src="imgutils.js"></script>
+  <script type="application/javascript" src="animationPolling.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <style>
+    li { color: transparent }
+  </style>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=666446">
+Mozilla Bug 666446: lots of animated gifs swamp us with paint events
+</a>
+<p id="display"></p>
+
+<div id="content">
+  <div id="cleanDiv" style="display: none;">
+    <ul>
+      <li></li>
+    </ul>
+  </div>
+  <div id="referenceDiv" style="display: none;">
+    <ul>
+      <li style="list-style-image: url(animated-gif-finalframe.gif);"></li>
+    </ul>
+  </div>
+  <div id="animatedImage" style="display: none;">
+      <ul>
+        <li style="list-style-image: url(animated-gif.gif);"></li>
+      </ul>
+  </div>
+  <div id="text-descr"></div>
+  <div id="debug" style="display:none">
+  </div>
+</div>
+<pre id="test">
+<script type="text/javascript">
+const FAILURE_TIMEOUT = 120000; // Fail early after 120 seconds (2 minutes)
+
+function main()
+{
+  var animTest = new AnimationTest(20, FAILURE_TIMEOUT, 'referenceDiv',
+                                   'animatedImage', 'debug', 'cleanDiv',
+                                   'animated-gif-finalframe.gif');
+  animTest.beginTest();
+}
+
+window.onload = main;
+</script>
+</pre>
+</body>
+</html>