--- a/toolkit/components/places/UnifiedComplete.js
+++ b/toolkit/components/places/UnifiedComplete.js
@@ -60,16 +60,17 @@ const TITLE_TAGS_SEPARATOR = " \u2013 ";
 
 const TOP500_SITES = [
   ["Google.com", "Google"],
   ["Youtube.com", "YouTube"],
   ["Facebook.com", "Facebook"],
   ["Baidu.com", "百度一下，你就知道"],
   ["Wikipedia.org", "Wikipedia"],
 ];
+const TOP500_FRECENCY = 0;
 
 // Telemetry probes.
 const TELEMETRY_1ST_RESULT = "PLACES_AUTOCOMPLETE_1ST_RESULT_TIME_MS";
 const TELEMETRY_6_FIRST_RESULTS = "PLACES_AUTOCOMPLETE_6_FIRST_RESULTS_TIME_MS";
 // The default frecency value used when inserting matches with unknown frecency.
 const FRECENCY_DEFAULT = 1000;
 
 // Remote matches are appended when local matches are below a given frecency
@@ -1013,17 +1014,17 @@ Search.prototype = {
   *_matchTop500() {
     for (let [url, title] of TOP500_SITES) {
       if (url.toLowerCase().includes(this._searchString) ||
           title.toLowerCase().includes(this._searchString)) {
         let match = {
           value: url,
           comment: title,
           style: "bookmark",
-          frecency: FRECENCY_DEFAULT + 1,
+          frecency: TOP500_FRECENCY,
         };
         this._addMatch(match);
       };
     };
   },
 
   *_matchFirstHeuristicResult(conn) {
     // We always try to make the first result a special "heuristic" result.  The