Examine source code of HTML Runner

{
  "manifest_version" : 2 ,
  "name" : "HTML Runner",
  "version" : "1.0",
  "description" : "Run HTML/CSS/JS instantly in a new tab",
  "browser_action" : {
    "default_title" : "HTML Runner"
  },
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "commands" : {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+H"
      }
    }
  },
  "permissions" : [
    "tabs" 
  ],
  "icons" : {
    "48" : "icons/icon-48.png",
    "96" : "icons/icon-96.png",
    "128" : "icons/icon-128.png"
  },
  "content_security_policy" : "script-src 'self'; object-src 'self';",
  "browser_specific_settings": {
    "gecko": {
      "id": "htmlrunner@mypwas.pages.dev",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}