diff --git a/hide-facebook-comments.js b/hide-facebook-comments.js
index 3199e55..df69834 100644
--- a/hide-facebook-comments.js
+++ b/hide-facebook-comments.js
@@ -68,12 +68,9 @@ function hideElementsByClassName(name) {
 }
 
 function hideElementsBySelector(selector) {
-  var e = document.getElementById(id);
-  if (e) {
-    var f = e.querySelectorAll(selector);
-    for (var i=0;i<f.length;i++) {
-      f[i].style = "display: none;";
-    }
+  var f = document.querySelectorAll(selector);
+  for (var i=0;i<f.length;i++) {
+    f[i].style = "display: none;";
   }
 }