Examine source code of PreciousMetals Prices

{
  "manifest_version": 2,
  "name": "PreciousMetals Prices",
  "version": "1.5.1",
  "description": "Displays the current prices of gold, silver, platinum, and palladium. Multilanguage. Customizable",
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "https://api.edelmetalle.de/*",
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "translations.js",
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b49eb805-ccc2-4b37-b1d6-bffefc15bcec}"
    }
  }
}