1 files changed, 64 insertions, 0 deletions
diff --git a/toolkit/components/extensions/test/mochitest/test_ext_canvas_resistFingerprinting.html b/toolkit/components/extensions/test/mochitest/test_ext_canvas_resistFingerprinting.html
new file mode 100644
index 0000000000..7116d03235
--- /dev/null
+++ b/toolkit/components/extensions/test/mochitest/test_ext_canvas_resistFingerprinting.html
@@ -0,0 +1,64 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>WebExtension test</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/ExtensionTestUtils.js"></script>
+  <script type="text/javascript" src="head.js"></script>
+  <script type="text/javascript" src="head_cookies.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<script type="text/javascript">
+"use strict";
+
+add_task(async function setup() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["privacy.resistFingerprinting", true]],
+  });
+});
+
+add_task(async function test_contentscript() {
+  function contentScript() {
+    let canvas = document.createElement("canvas");
+    canvas.width = canvas.height = "100";
+
+    let ctx = canvas.getContext("2d");
+    ctx.fillStyle = "green";
+    ctx.fillRect(0, 0, 100, 100);
+    let data = ctx.getImageData(0, 0, 100, 100);
+
+    browser.test.sendMessage("data-color", data.data[1]);
+  }
+
+  let extensionData = {
+    manifest: {
+      content_scripts: [
+        {
+          "matches": ["http://mochi.test/*/file_sample.html"],
+          "js": ["content_script.js"],
+          "run_at": "document_start",
+        },
+      ],
+    },
+
+    files: {
+      "content_script.js": contentScript,
+    },
+  };
+  const url = "http://mochi.test:8888/chrome/toolkit/components/extensions/test/mochitest/file_sample.html";
+
+  let extension = ExtensionTestUtils.loadExtension(extensionData);
+
+  await extension.startup();
+  let win = window.open(url);
+  let color = await extension.awaitMessage("data-color");
+  is(color, 128, "Got correct pixel data for green");
+  win.close();
+  await extension.unload();
+});
+</script>
+
+</body>
+</html>