diff --git a/data/models/urlStopwords.js b/data/models/urlStopwords.json
similarity index 95%
rename from data/models/urlStopwords.js
rename to data/models/urlStopwords.json
index 75ce37e..bacd7fa 100644
--- a/data/models/urlStopwords.js
+++ b/data/models/urlStopwords.json
@@ -1,4 +1,4 @@
-var interestsUrlStopwords = {
+{
   "com": true,
   "net": true,
   "org": true,
diff --git a/lib/WorkerFactory.js b/lib/WorkerFactory.js
index 50d7734..a2d84bc 100644
--- a/lib/WorkerFactory.js
+++ b/lib/WorkerFactory.js
@@ -85,7 +85,7 @@ WorkerFactory.prototype = {
     let scriptLoader = Cc["@mozilla.org/moz/jssubscript-loader;1"].getService(Ci.mozIJSSubScriptLoader);
     scriptLoader.loadSubScript(data.url("models/" + this._localeCode + "/" + modelName + "/domainRules.js"));
     // use the same url stop words
-    scriptLoader.loadSubScript(data.url("models/urlStopwords.js"));
+    let interestsUrlStopwords = JSON.parse(data.load("models/urlStopwords.json"));
 
     let worker = new ChromeWorker(data.url("interests/interestsWorker.js"));
     worker.postMessage({
diff --git a/test/test-ChineseTokenizer.js b/test/test-ChineseTokenizer.js
index e2c4181..3593b43 100644
--- a/test/test-ChineseTokenizer.js
+++ b/test/test-ChineseTokenizer.js
@@ -13,7 +13,7 @@ const {testUtils} = require("./helpers");
 const {Cc, Ci} = require("chrome");
 
 let scriptLoader = Cc["@mozilla.org/moz/jssubscript-loader;1"].getService(Ci.mozIJSSubScriptLoader);
-scriptLoader.loadSubScript(data.url("models/urlStopwords.js"));
+let interestsUrlStopwords = JSON.parse(data.load("models/urlStopwords.json"));
 scriptLoader.loadSubScript(data.url("models/zh-CN/41-cat/domainRules.js"));
 scriptLoader.loadSubScript(data.url("interests/tokenizers/zh-CN.js"));