--- a/content/html/content/test/test_bug643051.html
+++ b/content/html/content/test/test_bug643051.html
@@ -17,29 +17,23 @@ https://bugzilla.mozilla.org/show_bug.cg
 </div>
 <pre id="test">
 <script type="application/javascript">
 
 /** Test for Bug 643051 **/
 document.cookie = "foo=; expires=Thu, 01-Jan-1970 00:00:01 GMT";  // clear cookie
 document.cookie = "foo2=; expires=Thu, 01-Jan-1970 00:00:01 GMT";  // clear cookie
 document.cookie = "foo3=; expires=Thu, 01-Jan-1970 00:00:01 GMT";  // clear cookie
-// clear cookie set by another test
-document.cookie = "a=; expires=Thu, 01-Jan-1970 00:00:01 GMT";
 
 // single cookie, should work
 document.cookie = "foo=bar";
 is(document.cookie, "foo=bar", "Can't read stored cookie!");
 
 document.cookie = "foo2=bar\nfoo3=bar";
 is(document.cookie, "foo=bar; foo2=bar", "Wrong cookie value");
 
 document.cookie = "foo2=baz; foo3=bar";
 is(document.cookie, "foo=bar; foo2=baz", "Wrong cookie value");
 
-// clear cookies again to avoid affecting other tests
-document.cookie = "foo=; expires=Thu, 01-Jan-1970 00:00:01 GMT";
-document.cookie = "foo2=; expires=Thu, 01-Jan-1970 00:00:01 GMT";
-document.cookie = "foo3=; expires=Thu, 01-Jan-1970 00:00:01 GMT";
 </script>
 </pre>
 </body>
 </html>