diff --git a/intl/uconv/tests/test_big5_encoder.html b/intl/uconv/tests/test_big5_encoder.html
index 33970d01017f..fbed34e593fb 100644
--- a/intl/uconv/tests/test_big5_encoder.html
+++ b/intl/uconv/tests/test_big5_encoder.html
@@ -24,14 +24,14 @@ SimpleTest.waitForExplicitFinish();
 function test() {
   var f = document.getElementsByTagName("iframe")[0];
   f.onload = function() {
-    var href = f.contentWindow.location.href;
+    var href = SpecialPowers.wrap(f).contentWindow.location.href;
     var index = href.indexOf("?foo=");
     var actual = href.substring(index + 5);
     var expected = "h%26%2340614%3Bi%26%23156267%3Bj%A1%40k%A3%E1l%A4%40m%C8%A4n%C8%CDo%FE%FEp%26%238365%3Bq%FDjr%F9%F9s%26%23128169%3Bt";
     is(actual, expected, "Should have gotten the expected encode.");
     SimpleTest.finish();
   }
-  f.contentDocument.forms[0].submit();
+  SpecialPowers.wrap(f).contentDocument.forms[0].submit();
 }
 </script>
 </pre>
diff --git a/intl/uconv/tests/test_long_doc.html b/intl/uconv/tests/test_long_doc.html
index f1ff75f66eb3..f64db3df2adc 100644
--- a/intl/uconv/tests/test_long_doc.html
+++ b/intl/uconv/tests/test_long_doc.html
@@ -89,7 +89,7 @@ function lastTest(frame)
 
 function testDecoding(frame)
 {
-    var iframeDoc = $(frame).contentDocument;
+    var iframeDoc = SpecialPowers.wrap($(frame)).contentDocument;
     var outString = iframeDoc.getElementById("testPara").innerHTML;
     is(outString, inString, "content decoded as " + frame);
 }