Examine source code of Amazon Price Compare

{
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "css": [
        "css/style.css"
      ],
      "js": [
        "lib/jquery.js",
        "lib/mustache.js",
        "lib/globalize.js",
        "lib/globalize.cultures.js",
        "compare.js"
      ],
      "matches": [
        "https://www.amazon.com/*",
        "https://www.amazon.com/*",
        "https://www.amazon.co.uk/*",
        "https://www.amazon.co.uk/*",
        "https://www.amazon.de/*",
        "https://www.amazon.de/*",
        "https://www.amazon.fr/*",
        "https://www.amazon.fr/*",
        "https://www.amazon.es/*",
        "https://www.amazon.es/*",
        "https://www.amazon.it/*",
        "https://www.amazon.it/*",
        "https://www.amazon.nl/*",
        "https://www.amazon.nl/*",
        "https://smile.amazon.com/*",
        "https://smile.amazon.com/*",
        "https://smile.amazon.co.uk/*",
        "https://smile.amazon.co.uk/*",
        "https://smile.amazon.de/*",
        "https://smile.amazon.de/*",
        "https://smile.amazon.fr/*",
        "https://smile.amazon.fr/*",
        "https://smile.amazon.es/*",
        "https://smile.amazon.es/*",
        "https://smile.amazon.it/*",
        "https://smile.amazon.it/*",
        "https://smile.amazon.nl/*",
        "https://smile.amazon.nl/*",
        "https://www.ecb.europa.eu/stats/eurofxref/*"
      ]
    }
  ],
  "description": "Compare prices across all Amazon european marketplaces. Save money by comparing prices of stores in the European Union.",
  "homepage_url": "https://dealfinder.altervista.org/",
  "icons": {
    "16": "icons/icon_16.png",
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "manifest_version": 2,
  "name": "Amazon Price Compare",
  "short_name": "Compare Amazon to Amazon prices!",
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "2.1",
  "web_accessible_resources": [
    "images/icon.png",
    "images/loader.gif",
    "images/placeholder.png",
    "images/return.png",
    "css/style.css",
    "tooltip.html"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{33c3825b-3acc-418b-a9b8-7b3f0494320d}"
    }
  }
}