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diff --git a/toolkit/components/webextensions/test/mochitest/test_ext_contentscript.html b/toolkit/components/webextensions/test/mochitest/test_ext_contentscript.html
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index 000000000..39f1bfabd
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+++ b/toolkit/components/webextensions/test/mochitest/test_ext_contentscript.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for content script</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/SpawnTask.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/ExtensionTestUtils.js"></script>
+  <script type="text/javascript" src="head.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<script type="text/javascript">
+"use strict";
+
+add_task(function* test_contentscript() {
+  function background() {
+    browser.runtime.onMessage.addListener(([msg, expectedStates, readyState], sender) => {
+      if (msg == "chrome-namespace-ok") {
+        browser.test.sendMessage(msg);
+        return;
+      }
+
+      browser.test.assertEq("script-run", msg, "message type is correct");
+      browser.test.assertTrue(expectedStates.includes(readyState),
+                              `readyState "${readyState}" is one of [${expectedStates}]`);
+      browser.test.sendMessage("script-run-" + expectedStates[0]);
+    });
+  }
+
+  function contentScriptStart() {
+    browser.runtime.sendMessage(["script-run", ["loading"], document.readyState]);
+  }
+  function contentScriptEnd() {
+    browser.runtime.sendMessage(["script-run", ["interactive", "complete"], document.readyState]);
+  }
+  function contentScriptIdle() {
+    browser.runtime.sendMessage(["script-run", ["complete"], document.readyState]);
+  }
+
+  function contentScript() {
+    let manifest = browser.runtime.getManifest();
+    void manifest.applications.gecko.id;
+    chrome.runtime.sendMessage(["chrome-namespace-ok"]);
+  }
+
+  let extensionData = {
+    manifest: {
+      applications: {gecko: {id: "contentscript@tests.mozilla.org"}},
+      content_scripts: [
+        {
+          "matches": ["http://mochi.test/*/file_sample.html"],
+          "js": ["content_script_start.js"],
+          "run_at": "document_start",
+        },
+        {
+          "matches": ["http://mochi.test/*/file_sample.html"],
+          "js": ["content_script_end.js"],
+          "run_at": "document_end",
+        },
+        {
+          "matches": ["http://mochi.test/*/file_sample.html"],
+          "js": ["content_script_idle.js"],
+          "run_at": "document_idle",
+        },
+        {
+          "matches": ["http://mochi.test/*/file_sample.html"],
+          "js": ["content_script.js"],
+          "run_at": "document_idle",
+        },
+      ],
+    },
+    background,
+
+    files: {
+      "content_script_start.js": contentScriptStart,
+      "content_script_end.js": contentScriptEnd,
+      "content_script_idle.js": contentScriptIdle,
+      "content_script.js": contentScript,
+    },
+  };
+
+  let extension = ExtensionTestUtils.loadExtension(extensionData);
+
+  let loadingCount = 0;
+  let interactiveCount = 0;
+  let completeCount = 0;
+  extension.onMessage("script-run-loading", () => { loadingCount++; });
+  extension.onMessage("script-run-interactive", () => { interactiveCount++; });
+
+  let completePromise = new Promise(resolve => {
+    extension.onMessage("script-run-complete", () => { completeCount++; resolve(); });
+  });
+
+  let chromeNamespacePromise = extension.awaitMessage("chrome-namespace-ok");
+
+  yield extension.startup();
+
+  let win = window.open("file_sample.html");
+
+  yield Promise.all([waitForLoad(win), completePromise, chromeNamespacePromise]);
+  info("test page loaded");
+
+  win.close();
+
+  is(loadingCount, 1, "document_start script ran exactly once");
+  is(interactiveCount, 1, "document_end script ran exactly once");
+  is(completeCount, 1, "document_idle script ran exactly once");
+
+  yield extension.unload();
+  info("extension unloaded");
+});
+</script>
+
+</body>
+</html>