Examine source code of GOG Prices

{
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "version": "0.1.1",
  "browser_action": {
    "default_icon": "assets/gog-prices-icon48.png"
  },
  "icons": {
    "16": "assets/gog-prices-icon16.png",
    "48": "assets/gog-prices-icon48.png",
    "128": "assets/gog-prices-icon128.png"
  },
  "permissions": [
    "*://*.gog.com/*",
    "storage"
  ],
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "web_accessible_resources": [
    "options/*"
  ],
  "content_scripts": [
    {
      "js": [
        "scripts/bg.js"
      ],
      "css": [
        "styles/styles.css"
      ],
      "matches": [
        "*://*.gog.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{234ba090-754b-4ccc-9e47-973028179479}"
    }
  }
}