Examine source code of Timebox-productivity

{
  "manifest_version" : 3 ,
  "name" : "Timebox",
  "version" : "1.3.0",
  "description" : "Productivity extension which temporarily block distracting websites to help you stay focused.",
  "permissions" : [
    "storage" ,
    "alarms" ,
    "declarativeNetRequest" 
  ],
  "host_permissions" : [
    "<all_urls>" 
  ],
  "background" : {
    "service_worker" : "background.js" ,
    "scripts" : [
      "background.js" 
    ]
  },
  "action" : {
    "default_title" : "Timebox",
    "default_popup" : "popup/popup.html",
    "default_icon" : {
      "16" : "icons/icon-16.png",
      "48" : "icons/icon-48.png",
      "128" : "icons/icon-128.png"
    }
  },
  "web_accessible_resources" : [
    {
      "resources" : [
        "blocked/blocked.html" ,
        "blocked/blocked.js" ,
        "blocked/blocked.css" ,
        "lock/lock.html" ,
        "lock/lock.js" ,
        "lock/lock.css" 
      ],
      "matches" : [
        "<all_urls>" 
      ]
    }
  ],
  "icons" : {
    "16" : "icons/icon-16.png",
    "48" : "icons/icon-48.png",
    "128" : "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "timebox.development@gmail.com",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}