diff --git a/intl/uconv/tests/test_unicode_noncharacterescapes.html b/intl/uconv/tests/test_unicode_noncharacterescapes.html
index c0005e6a4205..4b14f7d661d7 100644
--- a/intl/uconv/tests/test_unicode_noncharacterescapes.html
+++ b/intl/uconv/tests/test_unicode_noncharacterescapes.html
@@ -10,14 +10,14 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=445886
   <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
 </head>
-<body>
+<body onload="Inject()">
 <pre id="test">
 <script class="testbody" type="text/javascript">
 
 /** Test that unicode non-characters are not discarded **/
 function test()
 {
-    ok($("display").innerHTML == "All good.", "Noncharacters not stripped");
+    is($("display").innerHTML,"All good.", "Noncharacters not stripped");
     SimpleTest.finish();
 }
 
@@ -291,7 +291,6 @@ function Inject()
     test();
 }
 
-  setTimeout(Inject, 100);
   SimpleTest.waitForExplicitFinish();
 </script>
 </pre>
diff --git a/intl/uconv/tests/test_unicode_noncharacters_gb18030.html b/intl/uconv/tests/test_unicode_noncharacters_gb18030.html
index bbbbf3747397..9e44d35e9e82 100644
--- a/intl/uconv/tests/test_unicode_noncharacters_gb18030.html
+++ b/intl/uconv/tests/test_unicode_noncharacters_gb18030.html
@@ -11,13 +11,13 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=445886
   <link rel="stylesheet" type="text/css"
  href="/tests/SimpleTest/test.css">
 </head>
-<body>
+<body onload="Inject()">
 <pre id="test"><script class="testbody" type="text/javascript">
 
 /** Test that unicode non-characters are not discarded **/
 function test()
 {
-    ok($("display").innerHTML == "All good.", "Noncharacters not stripped");
+    is($("display").innerHTML, "All good.", "Noncharacters not stripped");
     SimpleTest.finish();
 }
 
@@ -291,7 +291,6 @@ function Inject()
     test();
 }
 
-  setTimeout(Inject, 100);
   SimpleTest.waitForExplicitFinish();
 </script>
 </pre>
diff --git a/intl/uconv/tests/test_unicode_noncharacters_utf8.html b/intl/uconv/tests/test_unicode_noncharacters_utf8.html
index 07dc0f4e19af..6a9a04e9fb4f 100644
--- a/intl/uconv/tests/test_unicode_noncharacters_utf8.html
+++ b/intl/uconv/tests/test_unicode_noncharacters_utf8.html
@@ -10,14 +10,14 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=445886
   <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
 </head>
-<body>
+<body onload="Inject()">
 <pre id="test">
 <script class="testbody" type="text/javascript">
 
 /** Test that unicode non-characters are not discarded **/
 function test()
 {
-    ok($("display").innerHTML == "All good.", "Noncharacters not stripped");
+    is($("display").innerHTML, "All good.", "Noncharacters not stripped");
     SimpleTest.finish();
 }
 
@@ -291,7 +291,6 @@ function Inject()
     test();
 }
 
-  setTimeout(Inject, 100);
   SimpleTest.waitForExplicitFinish();
 </script>
 </pre>
diff --git a/intl/uconv/tests/test_utf8_overconsumption.html b/intl/uconv/tests/test_utf8_overconsumption.html
index db9ede2ecf76..a79496efb7a0 100644
--- a/intl/uconv/tests/test_utf8_overconsumption.html
+++ b/intl/uconv/tests/test_utf8_overconsumption.html
@@ -23,7 +23,7 @@ function Inject()
 /** test that UTF-8 decoding resynchronizes after incomplete sequences */
 function test()
 {
-    ok($("display").innerHTML == "All good.", "No overconsumption");
+    is($("display").innerHTML, "All good.", "No overconsumption");
     SimpleTest.finish();
 }
 
