diff --git a/editor/libeditor/tests/browser.ini b/editor/libeditor/tests/browser.ini
index bb84c9263425..249f59aa8fa7 100644
--- a/editor/libeditor/tests/browser.ini
+++ b/editor/libeditor/tests/browser.ini
@@ -1,3 +1,6 @@
+[browser_bug527935.js]
+skip-if = toolkit == 'android'
+support-files = bug527935.html
 [browser_bug629172.js]
 skip-if = toolkit == 'android'
 support-files = bug629172.html
diff --git a/editor/libeditor/tests/browser_bug527935.js b/editor/libeditor/tests/browser_bug527935.js
new file mode 100644
index 000000000000..dc6e74d3e700
--- /dev/null
+++ b/editor/libeditor/tests/browser_bug527935.js
@@ -0,0 +1,63 @@
+add_task(function*() {
+  yield new Promise(resolve => waitForFocus(resolve, window));
+
+  const kPageURL = "http://example.org/browser/editor/libeditor/tests/bug527935.html";
+  yield BrowserTestUtils.withNewTab({
+    gBrowser,
+    url: kPageURL
+  }, function*(aBrowser) {
+    var popupShown = false;
+    function listener() {
+      popupShown = true;
+    }
+    SpecialPowers.addAutoCompletePopupEventListener(window, "popupshowing", listener);
+
+    yield ContentTask.spawn(aBrowser, {}, function*() {
+      var window = content.window.wrappedJSObject;
+      var document = window.document;
+      var formTarget = document.getElementById("formTarget");
+      var initValue = document.getElementById("initValue");
+
+      window.loadPromise = new Promise(resolve => {
+        formTarget.onload = resolve;
+      });
+
+      initValue.focus();
+      initValue.value = "foo";
+    });
+
+    EventUtils.synthesizeKey("VK_RETURN", {});
+
+    yield ContentTask.spawn(aBrowser, {}, function*() {
+      var window = content.window.wrappedJSObject;
+      var document = window.document;
+
+      yield window.loadPromise;
+
+      var newInput = document.createElement("input");
+      newInput.setAttribute("name", "test");
+      document.body.appendChild(newInput);
+
+      var event = document.createEvent("KeyboardEvent");
+
+      event.initKeyEvent("keypress", true, true, null, false, false,
+                         false, false, 0, "f".charCodeAt(0));
+      newInput.value = "";
+      newInput.focus();
+      newInput.dispatchEvent(event);
+    });
+
+    yield new Promise(resolve => hitEventLoop(resolve, 100));
+
+    ok(!popupShown, "Popup must not be opened");
+    SpecialPowers.removeAutoCompletePopupEventListener(window, "popupshowing", listener);
+  });
+});
+
+function hitEventLoop(func, times) {
+  if (times > 0) {
+    setTimeout(hitEventLoop, 0, func, times - 1);
+  } else {
+    setTimeout(func, 0);
+  }
+}
diff --git a/editor/libeditor/tests/bug527935.html b/editor/libeditor/tests/bug527935.html
new file mode 100644
index 000000000000..4bfa1bac230c
--- /dev/null
+++ b/editor/libeditor/tests/bug527935.html
@@ -0,0 +1,11 @@
+<!DOCTYPE HTML>
+<html>
+<body>
+<div id="content">
+  <iframe id="formTarget" name="formTarget"></iframe>
+  <form action="data:text/html," target="formTarget">
+    <input name="test" id="initValue"><input type="submit">
+  </form>
+</div>
+</body>
+</html
diff --git a/editor/libeditor/tests/mochitest.ini b/editor/libeditor/tests/mochitest.ini
index 6b022fa7c6b2..a24ce5e93c8f 100644
--- a/editor/libeditor/tests/mochitest.ini
+++ b/editor/libeditor/tests/mochitest.ini
@@ -58,8 +58,6 @@ skip-if = toolkit == 'android'
 skip-if = toolkit == 'android'
 [test_bug525389.html]
 skip-if = toolkit == 'android'
-[test_bug527935.html]
-skip-if = toolkit == 'android' || e10s
 [test_bug537046.html]
 [test_bug549262.html]
 skip-if = toolkit == 'android'
diff --git a/editor/libeditor/tests/test_bug527935.html b/editor/libeditor/tests/test_bug527935.html
deleted file mode 100644
index 1ebda1f150dd..000000000000
--- a/editor/libeditor/tests/test_bug527935.html
+++ /dev/null
@@ -1,74 +0,0 @@
-<!DOCTYPE HTML>
-<html>
-<!--
-https://bugzilla.mozilla.org/show_bug.cgi?id=527935
--->
-<head>
-  <title>Test for Bug 527935</title>
-  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
-  <script type="text/javascript" src="/tests/SimpleTest/EventUtils.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=527935">Mozilla Bug 527935</a>
-<p id="display"></p>
-<div id="content">
-  <iframe id="formTarget" name="formTarget"></iframe>
-  <form action="data:text/html," target="formTarget">
-    <input name="test" id="initValue"><input type="submit">
-  </form>
-</div>
-<pre id="test">
-<script type="application/javascript">
-
-/** Test for Bug 527935 **/
-SimpleTest.waitForExplicitFinish();
-SimpleTest.waitForFocus(function() {
-  var formTarget = document.getElementById("formTarget");
-  var initValue = document.getElementById("initValue");
-
-  formTarget.addEventListener("load", function() {
-    var newInput = document.createElement("input");
-    newInput.setAttribute("name", "test");
-    document.body.appendChild(newInput);
-
-    setTimeout(function() {
-      var popupShown = false;
-      function listener() {
-        popupShown = true;
-      }
-      SpecialPowers.addAutoCompletePopupEventListener(window, "popupshowing", listener);
-
-      var event = document.createEvent("KeyboardEvent");
-
-      event.initKeyEvent("keypress", true, true, null, false, false,
-                         false, false, 0, "f".charCodeAt(0));
-      newInput.value = "";
-      newInput.focus();
-      newInput.dispatchEvent(event);
-
-      hitEventLoop(function() {
-        ok(!popupShown, "Popup must not be opened");
-        SpecialPowers.removeAutoCompletePopupEventListener(window, "popupshowing", listener);
-        SimpleTest.finish();
-      }, 100);
-    }, 0);
-  }, false);
-
-  initValue.focus();
-  initValue.value = "foo";
-  synthesizeKey("VK_RETURN", {});
-});
-
-function hitEventLoop(func, times) {
-  if (times > 0) {
-    setTimeout(hitEventLoop, 0, func, times - 1);
-  } else {
-    setTimeout(func, 0);
-  }
-}
-
-</script>
-</pre>
-</body>
-</html>
