--- a/content/events/test/test_bug602962.xul
+++ b/content/events/test/test_bug602962.xul
@@ -68,16 +68,22 @@ function resize() {
       finish();
     }, 0);
   }, true);
 
   win.resizeTo(oldWidth, oldHeight);
 }
 
 function finish() {
+  if (win.outerWidth != oldWidth ||
+      win.outerHeight != oldHeight) {
+    // We should eventually get back to the original size.
+    setTimeout(finish, 0);
+    return;
+  }
   is(mozBeforeResizeHasFired, true, "The MozBeforeResize event should already have fired");
   sbo.scrollBy(scrollX, scrollY);
 
   let x = {}, y = {};
   sbo.getPosition(x, y);
   is(x.value, 200, "Scroll X should have been restored to the value before the resize");
   is(y.value, 0, "Scroll Y should have been restored to the value before the resize");