diff --git a/browser/base/content/test/general/browser.ini b/browser/base/content/test/general/browser.ini
index 835e148669a..07670be6a46 100644
--- a/browser/base/content/test/general/browser.ini
+++ b/browser/base/content/test/general/browser.ini
@@ -334,7 +334,6 @@ skip-if = os == "linux" # Linux: Intermittent failures, bug 917535
 [browser_menuButtonFitts.js]
 skip-if = os != "win" # The Fitts Law menu button is only supported on Windows (bug 969376)
 [browser_middleMouse_noJSPaste.js]
-skip-if = e10s # Bug 921952 - Content:Click event issues
 [browser_minimize.js]
 skip-if = e10s # Bug 1100664 - test directly access content docShells (TypeError: gBrowser.docShell is null)
 [browser_mixedcontent_securityflags.js]
diff --git a/browser/base/content/test/general/browser_middleMouse_noJSPaste.js b/browser/base/content/test/general/browser_middleMouse_noJSPaste.js
index dc8755d7352..f51095cc3d8 100644
--- a/browser/base/content/test/general/browser_middleMouse_noJSPaste.js
+++ b/browser/base/content/test/general/browser_middleMouse_noJSPaste.js
@@ -3,51 +3,32 @@
 
 const middleMousePastePref = "middlemouse.contentLoadURL";
 const autoScrollPref = "general.autoScroll";
-function test() {
-  waitForExplicitFinish();
 
-  Services.prefs.setBoolPref(middleMousePastePref, true);
-  Services.prefs.setBoolPref(autoScrollPref, false);
-  let tab = gBrowser.selectedTab = gBrowser.addTab();
+add_task(function* () {
+  yield pushPrefs([middleMousePastePref, true], [autoScrollPref, false]);
 
-  registerCleanupFunction(function () {
-    Services.prefs.clearUserPref(middleMousePastePref);
-    Services.prefs.clearUserPref(autoScrollPref);
-    gBrowser.removeTab(tab);
-  });
+  let tab = yield BrowserTestUtils.openNewForegroundTab(gBrowser);
 
-  addPageShowListener(function () {
-    let pagePrincipal = gBrowser.contentPrincipal;
-
-    // copy javascript URI to the clipboard
-    let url = "javascript:http://www.example.com/";
-    waitForClipboard(url,
-      function() {
-        Components.classes["@mozilla.org/widget/clipboardhelper;1"]
-                  .getService(Components.interfaces.nsIClipboardHelper)
-                  .copyString(url, document);
-      },
-      function () {
-        // Middle click on the content area
-        info("Middle clicking");
-        EventUtils.sendMouseEvent({type: "click", button: 1}, gBrowser);
-      },
-      function() {
-        ok(false, "Failed to copy URL to the clipboard");
-        finish();
-      }
-    );
-
-    addPageShowListener(function () {
-      is(gBrowser.currentURI.spec, url.replace(/^javascript:/, ""), "url loaded by middle click doesn't include JS");
-      finish();
+  let url = "javascript:http://www.example.com/";
+  yield new Promise((resolve, reject) => {
+    SimpleTest.waitForClipboard(url, () => {
+      Components.classes["@mozilla.org/widget/clipboardhelper;1"]
+                .getService(Components.interfaces.nsIClipboardHelper)
+                .copyString(url, document);
+    }, resolve, () => {
+      ok(false, "Clipboard copy failed");
+      reject();
     });
   });
-}
 
-function addPageShowListener(func) {
-  gBrowser.selectedBrowser.addEventListener("pageshow", function loadListener() {
-    gBrowser.selectedBrowser.removeEventListener("pageshow", loadListener, false);
-    func();
-  });
-}
+  let middlePagePromise = BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+
+  // Middle click on the content area
+  info("Middle clicking");
+  yield BrowserTestUtils.synthesizeMouse(null, 10, 10, {button: 1}, gBrowser.selectedBrowser);
+  yield middlePagePromise;
+
+  is(gBrowser.currentURI.spec, url.replace(/^javascript:/, ""), "url loaded by middle click doesn't include JS");
+
+  gBrowser.removeTab(tab);
+});
diff --git a/browser/base/content/test/general/browser_wyciwyg_urlbarCopying.js b/browser/base/content/test/general/browser_wyciwyg_urlbarCopying.js
index 53456ed85c4..0f8a0388f67 100644
--- a/browser/base/content/test/general/browser_wyciwyg_urlbarCopying.js
+++ b/browser/base/content/test/general/browser_wyciwyg_urlbarCopying.js
@@ -2,14 +2,17 @@
    http://creativecommons.org/publicdomain/zero/1.0/ */
 
 function testURLBarCopy(targetValue) {
-  return new Promise(resolve => {
+  return new Promise((resolve, reject) => {
     info("Expecting copy of: " + targetValue);
     waitForClipboard(targetValue, function () {
       gURLBar.focus();
       gURLBar.select();
 
       goDoCommand("cmd_copy");
-    }, resolve);
+    }, resolve, () => {
+      ok(false, "Clipboard copy failed");
+      reject();
+    });
   });
 }