Examine source code of Amazon Price Drop Alerts Price Tracker

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "description": "Amazon Price Drop Alerts — Price Tracker. Drop alerts, history, verdicts, fake-deal flag, eBay compare. Local-first, no account.",
  "version": "0.1.0",
  "short_name": "Drop Alerts",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png",
    "512": "icon/512.png"
  },
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "amazon-price-watch@dracon.uk",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "notifications",
    "alarms",
    "contextMenus",
    "https://www.amazon.com/*",
    "https://www.amazon.co.uk/*",
    "https://www.amazon.de/*",
    "https://www.amazon.fr/*",
    "https://www.amazon.it/*",
    "https://www.amazon.es/*",
    "https://www.amazon.nl/*",
    "https://www.amazon.ca/*",
    "https://www.amazon.com.au/*",
    "https://www.amazon.co.jp/*",
    "https://www.amazon.in/*",
    "https://www.amazon.com.mx/*",
    "https://www.amazon.com.br/*"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self';",
  "options_page": "options.html",
  "options_ui": {
    "open_in_tab": false,
    "page": "options.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Amazon Price Drop Alerts",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.amazon.ca/*",
        "https://www.amazon.co.jp/*",
        "https://www.amazon.co.uk/*",
        "https://www.amazon.com.au/*",
        "https://www.amazon.com.br/*",
        "https://www.amazon.com.mx/*",
        "https://www.amazon.com/*",
        "https://www.amazon.de/*",
        "https://www.amazon.es/*",
        "https://www.amazon.fr/*",
        "https://www.amazon.in/*",
        "https://www.amazon.it/*",
        "https://www.amazon.nl/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/amazon.js"
      ]
    }
  ]
}