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diff --git a/dom/asmjscache/test/test_workers.html b/dom/asmjscache/test/test_workers.html
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+++ b/dom/asmjscache/test/test_workers.html
@@ -0,0 +1,74 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=941830
+-->
+<head>
+  <meta charset="utf-8">
+  <title>asm.js browser tests</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+  <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=941830">asm.js browser tests</a>
+  <p id="display"></p>
+  <div id="content" style="display: none"></div>
+  <pre id="test"></pre>
+
+  <script>
+  var jsFuns = SpecialPowers.Cu.getJSTestingFunctions();
+
+  function runTest() {
+      var asmjsCode = "function f() { 'use asm';";
+      for (var i = 0; i < 5000; i++)
+        asmjsCode += "function g" + i + "() { return " + i + "}";
+      asmjsCode += "return g42 }";
+      ok(asmjsCode.length > 100000, "code is long enough to definitely hit the cache");
+
+      var workerCode = asmjsCode;
+      workerCode += "if (f()() !== 42) postMessage('fail'); else postMessage('ok');";
+      workerCode = 'var code = "' + workerCode + '"; eval(code); eval(code)';
+      var workerBlob = new Blob([workerCode], {type:"application/javascript"});
+
+      var mainCode = asmjsCode;
+      mainCode += "ok(!jsFuns.isAsmJSModuleLoadedFromCache(f), 'f is not a cache hit')\n";
+      mainCode += "var g42 = f();\n";
+      mainCode += "ok(jsFuns.isAsmJSFunction(g42), 'g42 is an asm.js function');\n";
+      mainCode += "ok(g42() === 42, 'g42 returns the correct result');\n";
+      mainCode += "SimpleTest.finish();\n";
+      var mainBlob = new Blob([mainCode], {type:"application/javascript"});
+
+      var w = new Worker(URL.createObjectURL(workerBlob));
+
+      var received = 0;
+      w.onmessage = function(e) {
+          switch (received) {
+            case 0:
+              ok(e.data === "ok", "Received first message");
+              received = 1;
+              break;
+            case 1:
+              ok(e.data === "ok", "Received second message");
+              received = 2;
+
+              var script = document.createElement('script');
+              script.src = URL.createObjectURL(mainBlob);
+              document.body.appendChild(script);
+              break;
+            default:
+              throw "Huh?";
+          }
+      }
+
+      SimpleTest.waitForExplicitFinish();
+  }
+
+  if (!jsFuns.isAsmJSCompilationAvailable()) {
+      ok(true, "isAsmJSCompilationAvailable is false, skipping this test!");
+  } else {
+      runTest();
+  }
+  </script>
+
+</body>
+</html>