Why storage.set / storage.get fails to set/get data?

I am having this problem in Chrome, but in Firefox webextensions there is not problem. So I ask why?

I have this function in background script. I add breakpoint to line with storage.set . I restart addon and I can access all the data in MyNamespace.data… The addon prints notification that installation was successfull, but the log shows empty object when I try to get data.

MyNamespace.checkIfExists = function (item) {
  if (chrome.runtime.lastError) {
    MyNamespace.notify("check-fail");
    console.log("error:" + chrome.runtime.lastError);
    console.log(chrome.runtime.lastError);
  } else {
    if ( ! ( "initiated" in item ) )
      {
      console.log("I'm initiating .. item:");
      console.log(item);
      /* Insert new data object */
      /* This saves default values into storage */       
      chrome.storage.local.set({
        easy:     MyNamespace.data.easy,
        advanced: MyNamespace.data.advanced,
        images:   MyNamespace.data.images,
        inspector:MyNamespace.data.inspector,
        extractor:MyNamespace.data.extractor,
        profiles: MyNamespace.data.profiles,
        default_profiles: MyNamespace.data.default_profiles        
        }, 
        () => {
          if (chrome.runtime.lastError) 
            { 
            MyNamespace.notify("write-fail");            
            console.log("local.set Error: " + chrome.runtime.lastError); }
          else
            {                         
            MyNamespace.notify("write-succeess");
            chrome.storage.local.get( {initiated: undefined, easy:undefined}, 
              (result) => {
                if (typeof result === undefined )
                  MyNamespace.notify("write-fail");
                console.log("found:");
                console.log(result);
                console.log("/end");
                }
              )
            chrome.storage.local.set( {initiated:true} );            
            MyNamespace.initiated = true;
            }
        } );
      }
    else
      MyNamespace.initiated = true;
  }
};

Result in console:
I’m initiating … item:
namespace.js:125 Object {}
namespace.js:149 found:
namespace.js:150 Object {}
namespace.js:151 /end

No error in console. In Chrome the object is empty. In Firefox I see one object to be saved, one property to be undefined.

{
  "applications": {
  "gecko": {
    "id": "some-options@mozilla.org",
    "strict_min_version": "48.0a1"
    }
  },
"description": "An example options ui",
"homepage_url": "https://github.com/mdn/webextensions-examples/tree/master/favourite-colour",
"manifest_version": 2,
"name": "Favourite colour",
"version": "1.0",
"icons": {  
  "48": "icons/eye-icon-colored-48.png"    
},
"options_ui": {
  "page": "options.html",
  "open_in_tab": true
  },
"browser_action": {
  "default_title": "Adapt page",
  "browser_style": true,
  "default_popup": "popup/settings.html",
  "default_icon": {
    "48": "icons/eye-icon-48.png"
  }
},
"web_accessible_resources": [
  "icons/hotkeys-icon-32.png"
  ],
"permissions": ["storage", "tabs", "activeTab", "notifications"],
"background": {
  "page": "background_scripts/background_scripts_bug_fix.html"
 },
"content_scripts": [
    {
    "matches": ["<all_urls>" ],
    "run_at": "document_start",
    "js": [
      "content_scripts/jquery-3.0.0.js",
      "content_scripts/namespace.js",
      "content_scripts/easy.js",
      "content_scripts/addListeners.js"
      ]
    }
  ],
"commands": {
  "easy": {
    "suggested_key": {
      "default": "Ctrl+Shift+U"    
    },
    "description": ""
  }
 }
}

Edit:

I have added this listener to be fired when storage data are saved:

chrome.storage.onChanged.addListener(function(changes, namespace) {
  for (key in changes) {
    var storageChange = changes[key];
    console.log('Storage key "%s" in namespace "%s" changed. ' +
                'Old value was "%s", new value is "%s".',
                key,
                namespace,
                storageChange.oldValue,
                storageChange.newValue);
  }
});

And I got this log:

Storage key "advanced" in namespace "local" changed. Old value was "Object", new value is "undefined".
namespace.js:241 Storage key "default_profiles" in namespace "local" changed. Old value was "Object", new value is "undefined".
namespace.js:241 Storage key "easy" in namespace "local" changed. Old value was "Object", new value is "undefined".
namespace.js:241 Storage key "extractor" in namespace "local" changed. Old value was "Object", new value is "undefined".
namespace.js:241 Storage key "images" in namespace "local" changed. Old value was "Object", new value is "undefined".
namespace.js:241 Storage key "initiated" in namespace "local" changed. Old value was "true", new value is "undefined".
namespace.js:241 Storage key "inspector" in namespace "local" changed. Old value was "Object", new value is "undefined".
namespace.js:241 Storage key "profiles" in namespace "local" changed. Old value was "Object", new value is "undefined".
namespace.js:124 I'm initiating .. item:
namespace.js:125 Object {}
namespace.js:241 Storage key "advanced" in namespace "local" changed. Old value was "undefined", new value is "Object".
namespace.js:241 Storage key "default_profiles" in namespace "local" changed. Old value was "undefined", new value is "Object".
namespace.js:241 Storage key "easy" in namespace "local" changed. Old value was "undefined", new value is "Object".
namespace.js:241 Storage key "extractor" in namespace "local" changed. Old value was "undefined", new value is "Object".
namespace.js:241 Storage key "images" in namespace "local" changed. Old value was "undefined", new value is "Object".
namespace.js:241 Storage key "inspector" in namespace "local" changed. Old value was "undefined", new value is "Object".
namespace.js:241 Storage key "profiles" in namespace "local" changed. Old value was "undefined", new value is "Object".
namespace.js:152 found:
namespace.js:153 Object {}
namespace.js:154 /end
namespace.js:241 Storage key "initiated" in namespace "local" changed. Old value was "undefined", new value is "true".

So what does this mean? I see word Object() in Chrome, white letters (Dark Theme) but it is not like link where I could click and see the object. This shows the data are loaded. But why I cannot watch the data in the Object?

  1. I cannot step into the callback so I cannot watch the data
  2. I cannot watch what is in the Object {} in Console… is looks like it is empty
  3. result in .get calback is empty … contains no properties

I have checked it with this code:
for (var key in result)
if (hasOwnProperty.call(result, key))
console.log(“key:” + key);

In Chrome no properties are listed, in Firefox Toolbox / Console they are listed.

As far as I understand the storage.set callback it should be fired after the save changes has been made and the db file is closed for write. So I expect that there shouldn’t be any problem in storage.get fired from inside storage.set

I have solved the problem.

I have found that

this does not work in Chrome:

chrome.storage.local.get({easy: undefined,profiles: undefined, default_profiles: undefined},

But in Firefox it works. So I must to change all locations where I use storage.get.