Examine source code of Convertigo

{
  "manifest_version": 2,
  "name": "Convertigo",
  "version": "1.1.15",
  "description": "Detects measurement units and currencies in selected text and shows conversions in a popup.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{35b94d47-b594-41a7-8b94-7a8353587685}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "menus",
    "tabs"
  ],
  "browser_action": {
    "default_title": "Convertigo",
    "default_popup": "options/options.html"
  },
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "lib/settings.js",
        "lib/parser.js",
        "lib/converter.js",
        "lib/currency-parser.js",
        "lib/currency-converter.js",
        "content/content.js"
      ],
      "css": [
        "content/content.css"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ]
}