Examine source code of TabNest - Tab Session Manager

{
  "manifest_version" : 3 ,
  "default_locale" : "en" ,
  "name" : "__MSG_extensionName__" ,
  "description" : "__MSG_extensionDescription__" ,
  "version" : "1.0.1",
  "background" : {
    "scripts" : [
      "js/background.js" 
    ]
  },
  "action" : {
    "default_icon" : {
      "16" : "icon_16.png",
      "48" : "icon_48.png",
      "128" : "icon_128.png"
    },
    "default_popup" : "popup.html",
    "default_title" : "__MSG_actionTitle__" 
  },
  "content_scripts" : [
    {
      "matches" : [
        "https://extensionpay.com/*" 
      ],
      "js" : [
        "js/extpay_content.js" 
      ],
      "run_at" : "document_start" 
    }
  ],
  "permissions" : [
    "storage" ,
    "unlimitedStorage" ,
    "tabs" ,
    "downloads" 
  ],
  "icons" : {
    "16" : "icon_16.png",
    "48" : "icon_48.png",
    "128" : "icon_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tabnest@creative-lab",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}