diff --git a/browser/base/content/test/browser_bug416661.js b/browser/base/content/test/browser_bug416661.js
index 728a05688a35..5f274a0afbfd 100644
--- a/browser/base/content/test/browser_bug416661.js
+++ b/browser/base/content/test/browser_bug416661.js
@@ -26,6 +26,7 @@ function continue_test_prefNotSet () {
 }
 
 function end_test_prefNotSet() {
+  tabElm.linkedBrowser.removeEventListener("load", end_test_prefNotSet, true);
   is(ZoomManager.zoom, zoomLevel, "the zoom level should have persisted");
 
   // Reset the zoom so that other tests have a fresh zoom level
diff --git a/browser/base/content/test/browser_bug427559.js b/browser/base/content/test/browser_bug427559.js
index fe5a51e94440..cba1e7cb1501 100644
--- a/browser/base/content/test/browser_bug427559.js
+++ b/browser/base/content/test/browser_bug427559.js
@@ -49,6 +49,7 @@ function test() {
   gBrowser.selectedTab = gBrowser.addTab();
 
   gBrowser.selectedBrowser.addEventListener("load", function () {
+    gBrowser.selectedBrowser.removeEventListener("load", arguments.callee, true);
     setTimeout(function () {
       var testPageWin = content;
 
diff --git a/browser/base/content/test/browser_bug432599.js b/browser/base/content/test/browser_bug432599.js
index 089594be22eb..4749ad872d45 100644
--- a/browser/base/content/test/browser_bug432599.js
+++ b/browser/base/content/test/browser_bug432599.js
@@ -46,6 +46,7 @@ let invokers = [invokeUsingStarButton, invokeUsingCtrlD];
 let currentInvoker = 0;
 
 function initTest() {
+  gBrowser.selectedBrowser.removeEventListener("load", initTest, true);
   // first, bookmark the page
   Application.bookmarks.toolbar.addBookmark("Bug 432599 Test", makeURI(testURL));
 
diff --git a/browser/base/content/test/browser_bug435035.js b/browser/base/content/test/browser_bug435035.js
index 9335a38a843a..ae865ef1286a 100644
--- a/browser/base/content/test/browser_bug435035.js
+++ b/browser/base/content/test/browser_bug435035.js
@@ -3,6 +3,7 @@ function test() {
 
   gBrowser.selectedTab = gBrowser.addTab();
   gBrowser.selectedBrowser.addEventListener("load", function () {
+    gBrowser.selectedBrowser.removeEventListener("load", arguments.callee, true);
     is(document.getElementById("identity-box").className,
        gIdentityHandler.IDENTITY_MODE_MIXED_CONTENT,
        "identity box has class name for mixed content");
diff --git a/browser/base/content/test/browser_bug477014.js b/browser/base/content/test/browser_bug477014.js
index a65d5a35698e..68bc42d3d405 100644
--- a/browser/base/content/test/browser_bug477014.js
+++ b/browser/base/content/test/browser_bug477014.js
@@ -80,6 +80,7 @@ function test() {
     is(newWindow.gBrowser.selectedTab.hasAttribute("busy"), true);
     is(newWindow.gBrowser.selectedTab.linkedBrowser.mIconURL,iconURLSpec);
     newWindow.close();
+    gBrowser.removeEventListener("pageshow", onPageShow, false);
     finish();
   }
 
diff --git a/browser/base/content/test/browser_pageInfo.js b/browser/base/content/test/browser_pageInfo.js
index 97df14f4e247..7d93c0aac837 100644
--- a/browser/base/content/test/browser_pageInfo.js
+++ b/browser/base/content/test/browser_pageInfo.js
@@ -34,7 +34,7 @@ function test() {
   }
 
   function handleLoad() {
-
+    this.removeEventListener("load", handleLoad, true);
     pageInfo = BrowserPageInfo();
     obs = Components.classes["@mozilla.org/observer-service;1"]
             .getService(Components.interfaces.nsIObserverService);
diff --git a/browser/base/content/test/browser_page_style_menu.js b/browser/base/content/test/browser_page_style_menu.js
index 74caf32e8956..3be0aeca7d1f 100644
--- a/browser/base/content/test/browser_page_style_menu.js
+++ b/browser/base/content/test/browser_page_style_menu.js
@@ -9,6 +9,7 @@ function test() {
 }
 
 function checkPageStyleMenu() {
+  this.removeEventListener("load", checkPageStyleMenu, true);
   var menupopup = document.getElementById("pageStyleMenu")
                           .getElementsByTagName("menupopup")[0];
   stylesheetFillPopup(menupopup);
diff --git a/browser/base/content/test/browser_tabfocus.js b/browser/base/content/test/browser_tabfocus.js
index b311ff9a24c3..96fcbf7f8f7c 100644
--- a/browser/base/content/test/browser_tabfocus.js
+++ b/browser/base/content/test/browser_tabfocus.js
@@ -146,6 +146,7 @@ var _browser_tabfocus_test_events = "";
 
 function _browser_tabfocus_test_eventOccured(event)
 {
+  this.removeEventListener(event.type, arguments.callee, true);
   var id;
   if (event.target instanceof Window)
     id = event.originalTarget.document.documentElement.id + "-window";