Index: lib/content/elemHideEmulation.js
===================================================================
--- a/lib/content/elemHideEmulation.js
+++ b/lib/content/elemHideEmulation.js
@@ -303,23 +303,23 @@
 {
   this._regexp = makeRegExpParameter(textContent);
 }
 
 ContainsSelector.prototype = {
   requiresHiding: true,
   dependsOnCharacterData: true,
 
-  *getSelectors(prefix, subtree, stylesheet)
+  *getSelectors(prefix, subtree, styles)
   {
-    for (let element of this.getElements(prefix, subtree, stylesheet))
+    for (let element of this.getElements(prefix, subtree, styles))
       yield [makeSelector(element, ""), subtree];
   },
 
-  *getElements(prefix, subtree, stylesheet)
+  *getElements(prefix, subtree, styles)
   {
     let actualPrefix = (!prefix || incompletePrefixRegexp.test(prefix)) ?
         prefix + "*" : prefix;
 
     let elements = scopedQuerySelectorAll(subtree, actualPrefix);
     if (elements)
     {
       for (let element of elements)