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diff --git a/devtools/shared/qrcode/tests/mochitest/test_decode.html b/devtools/shared/qrcode/tests/mochitest/test_decode.html
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+++ b/devtools/shared/qrcode/tests/mochitest/test_decode.html
@@ -0,0 +1,68 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Test decoding a simple message
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test decoding a simple message</title>
+
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
+  <script type="application/javascript;version=1.8">
+window.onload = function() {
+  const { utils: Cu } = Components;
+  const { require } = Cu.import("resource://devtools/shared/Loader.jsm", {});
+  const { Task } = require("devtools/shared/task");
+  const promise = require("promise");
+  const defer = require("devtools/shared/defer");
+
+  const QR = require("devtools/shared/qrcode/index");
+
+  SimpleTest.waitForExplicitFinish();
+
+  const testImage =
+    "data:image/gif;base64,R0lGODdhOgA6AIAAAAAAAP///ywAAAAAOgA6AAAC" +
+    "/4yPqcvtD6OctNqLs968+w+G4gKU5nkaKKquLuW+QVy2tAkDTj3rfQts8CRDko" +
+    "+HPPoYRUgy9YsyldDm44mLWhHYZM6W7WaDqyCRGkZDySxpRGw2sqvLt1q5w/fo" +
+    "XyE6vnUQOJUHBlinMGh046V1F5PDqNcoqcgBOWKBKbK2N+aY+Ih49VkmqMcl2l" +
+    "dkhZUK1umE6jZXJ2ZJaujZaRqH4bpb2uZrJxvIt4Ebe9qoYYrJOsw8apz2bCut" +
+    "m9kqDcw52uuImyr5Oh1KXH1jrn2anuunywtODU/o2c6teceW39ZcLFg/fNMo1b" +
+    "t3jVw2dwTPwJq1KYG3gAklCgu37yGxeScYKyiCc+7DR34hPVQiuQ7UhJMagyEb" +
+    "lymmzJk0a9q8iTOnzp0NCgAAOw==";
+
+  Task.spawn(function() {
+    let result = yield QR.decodeFromURI(testImage);
+    is(result, "HELLO", "Decoded data URI result matches");
+    let canvas = yield drawToCanvas(testImage);
+    result = QR.decodeFromCanvas(canvas);
+    is(result, "HELLO", "Decoded canvas result matches");
+  }).then(SimpleTest.finish, ok.bind(null, false));
+
+  function drawToCanvas(src) {
+    let deferred = defer();
+    let canvas = document.createElement("canvas");
+    let context = canvas.getContext("2d");
+    let image = new Image();
+
+    image.onload = () => {
+      canvas.width = image.width;
+      canvas.height = image.height;
+      context.drawImage(image, 0, 0);
+      deferred.resolve(canvas);
+    };
+    image.src = src;
+
+    return deferred.promise;
+  }
+};
+  </script>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>