can auto-rename downloading zip files

background.js

 'use strict';
 
-chrome.runtime.onInstalled.addListener(function() {
-  chrome.storage.sync.set({color: '#3aa757'}, function() {
-    console.log("The color is green.");
-  });
-});
-
 chrome.declarativeContent.onPageChanged.removeRules(undefined, function() {
     chrome.declarativeContent.onPageChanged.addRules([{
       conditions: [new chrome.declarativeContent.PageStateMatcher({
@@ -15,3 +9,18 @@ chrome.declarativeContent.onPageChanged.removeRules(undefined, function() {
           actions: [new chrome.declarativeContent.ShowPageAction()]
     }]);
 });
+var initial = 0;
+var a;
+
+chrome.extension.onMessage.addListener(function(request,sender,sendResponse){
+  chrome.storage.local.get('idArray',function(item) {
+    a = item.idArray.split(',');
+  });
+  console.log(a);
+});
+
+chrome.downloads.onDeterminingFilename.addListener(function(item, suggest) {
+  var new_filename = a[initial] + ".zip"; 
+  suggest({filename: new_filename});
+  initial++;
+});
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manifest.json

@@ -12,7 +12,7 @@
 
     "manifest_version" : 2,
 
-    "permissions" : ["tabs","*://*/*","activeTab","<all_urls>","declarativeContent","storage"],
+    "permissions" : ["tabs","*://*/*","activeTab","<all_urls>","declarativeContent","storage","downloads"],
 
     "page_action": {
         "default_popup": "popup.html",

popup.js

@@ -22,6 +22,7 @@ chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab) {
       chrome.storage.local.set({idArray : idArray}, function () {
           console.log("set storage");
       });
+      chrome.runtime.sendMessage(null);
     }); 
   }
 });
\ No newline at end of file