Index: lib/filterComposer.js
===================================================================
--- a/lib/filterComposer.js
+++ b/lib/filterComposer.js
@@ -86,23 +86,23 @@
     let docDomain = extractHostFromFrame(frame);
     let specificOnly = checkWhitelisted(page, frame, null,
                                         RegExpFilter.typeMap.GENERICBLOCK);
 
     // Add a blocking filter for each URL of the element that can be blocked
     for (let url of details.urls)
     {
       let urlObj = new URL(url, details.baseURL);
-      let filter = defaultMatcher.whitelist.matchesAny(
+      let whitelisted = defaultMatcher.isWhitelisted(
         urlObj.href, typeMask, docDomain,
         isThirdParty(urlObj, docDomain),
         getKey(page, frame), specificOnly
       );
 
-      if (!filter)
+      if (!whitelisted)
       {
         let filterText = urlObj.href.replace(/^[\w-]+:\/+(?:www\.)?/, "||");
 
         if (specificOnly)
           filterText += "$domain=" + docDomain;
 
         if (!filters.includes(filterText))
           filters.push(filterText);