Examine source code of FutureMoney

{
  "manifest_version": 2,
  "name": "FutureMoney",
  "version": "0.7",
  "description": "The future of money could very well be cryptocurrencies. To get a better feel for them, they should be displayed everywhere where fiat money is displayed.",
  "homepage_url": "https://github.com/basti42/FutureMoney",
  "icons": {
    "48": "icons/futuremoney48px.png",
    "96": "icons/futuremoney96px.png"
  },
  "permissions": [
    "unlimitedStorage",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icons/futuremoney48px.png",
    "default_title": "FutureMoney"
  },
  "background": {
    "scripts": [
      "background.js",
      "control-panel-launcher.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.amazon.de/*",
        "*://*.amazon.fr/*",
        "*://*.amazon.nl/*",
        "*://*.amazon.es/*",
        "*://*.amazon.it/*"
      ],
      "js": [
        "content-scripts/content_script.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "icons/symbol_mota.png",
    "icons/symbol_btc.png"
  ]
}