Examine source code of ReviewExport for Amazon

{
  "manifest_version" : 3 ,
  "name" : "ReviewExport for Amazon",
  "version" : "0.1.0",
  "description" : "Export an Amazon product's reviews to CSV — free when they're already in our library. Not affiliated with Amazon.",
  "icons" : {
    "16" : "icons/16.png",
    "48" : "icons/48.png",
    "128" : "icons/128.png"
  },
  "action" : {
    "default_popup" : "popup.html",
    "default_title" : "ReviewExport",
    "default_icon" : {
      "16" : "icons/16.png",
      "48" : "icons/48.png",
      "128" : "icons/128.png"
    }
  },
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "host_permissions" : [
    "https://reviewexport.com/*" 
  ],
  "content_scripts" : [
    {
      "matches" : [
        "*://*.amazon.com/*" ,
        "*://*.amazon.co.uk/*" ,
        "*://*.amazon.de/*" ,
        "*://*.amazon.co.jp/*" ,
        "*://*.amazon.fr/*" ,
        "*://*.amazon.it/*" ,
        "*://*.amazon.es/*" ,
        "*://*.amazon.ca/*" ,
        "*://*.amazon.com.mx/*" ,
        "*://*.amazon.ae/*" ,
        "*://*.amazon.com.au/*" ,
        "*://*.amazon.com.br/*" ,
        "*://*.amazon.in/*" ,
        "*://*.amazon.sa/*" 
      ],
      "js" : [
        "lib.js" ,
        "content.js" 
      ],
      "css" : [
        "content.css" 
      ],
      "run_at" : "document_idle" 
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "reviewexport@reviewexport.com",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ]
      }
    }
  }
}