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diff --git a/toolkit/components/webextensions/test/mochitest/test_chrome_ext_eventpage_warning.html b/toolkit/components/webextensions/test/mochitest/test_chrome_ext_eventpage_warning.html
new file mode 100644
index 000000000..ecea8237e
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+++ b/toolkit/components/webextensions/test/mochitest/test_chrome_ext_eventpage_warning.html
@@ -0,0 +1,106 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for WebExtension EventPage Warning</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SpawnTask.js"></script>
+  <script src="chrome://mochikit/content/tests/SimpleTest/ExtensionTestUtils.js"></script>
+  <script type="text/javascript" src="chrome_head.js"></script>
+  <script type="text/javascript" src="head.js"></script>
+  <link rel="stylesheet" href="chrome://mochikit/contents/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<script type="text/javascript">
+"use strict";
+
+function createEventPageExtension(eventPage) {
+  function eventPageScript() {
+    browser.test.log("running event page as background script");
+    browser.test.sendMessage("running", 1);
+  }
+
+  return ExtensionTestUtils.loadExtension({
+    manifest: {
+      "background": eventPage,
+    },
+    files: {
+      "event-page-script.js": eventPageScript,
+      "event-page.html": `<html><head>
+        <meta charset="utf-8">
+        <script src="event-page-script.js"><\/script>
+      </head></html>`,
+    },
+  });
+}
+
+add_task(function* test_eventpages() {
+  // Used in other tests to prevent the monitorConsole to grip.
+  SimpleTest.waitForExplicitFinish();
+
+  let testCases = [
+    {
+      message: "testing event page running as a background page",
+      eventPage: {
+        "page": "event-page.html",
+        "persistent": false,
+      },
+    },
+    {
+      message: "testing event page scripts running as a background page",
+      eventPage: {
+        "scripts": ["event-page-script.js"],
+        "persistent": false,
+      },
+    },
+  ];
+
+  for (let {message, eventPage} of testCases) {
+    info(message);
+
+    // Wait for the expected logged warnings from the manifest validation.
+    let waitForConsole = new Promise(resolve => {
+      SimpleTest.monitorConsole(resolve, [{message: /Event pages are not currently supported./}]);
+    });
+
+    let extension = createEventPageExtension(eventPage);
+
+    info("load complete");
+    let [, x] = yield Promise.all([extension.startup(), extension.awaitMessage("running")]);
+    is(x, 1, "got correct value from extension");
+    info("test complete");
+    yield extension.unload();
+    info("extension unloaded successfully");
+
+    SimpleTest.endMonitorConsole();
+    yield waitForConsole;
+
+    waitForConsole = new Promise(resolve => {
+      SimpleTest.monitorConsole(resolve, [{
+        message: /Reading manifest: Error processing background.nonExistentProp: An unexpected property was found/,
+      }]);
+    });
+
+    info("testing additional unrecognized properties on background page");
+
+    extension = createEventPageExtension({
+      "scripts": ["event-page-script.js"],
+      "nonExistentProp": true,
+    });
+
+    info("load complete");
+    [, x] = yield Promise.all([extension.startup(), extension.awaitMessage("running")]);
+    is(x, 1, "got correct value from extension");
+    info("test complete");
+    yield extension.unload();
+    info("extension unloaded successfully");
+
+    SimpleTest.endMonitorConsole();
+    yield waitForConsole;
+  }
+});
+
+</script>
+
+</body>
+</html>