Examine source code of Find Korea from Dropdowns

{
  "name": "Find Korea from Dropdowns",
  "manifest_version": 2,
  "description": "Automatically finds Korea from html select tags (dropdowns) with right-click",
  "version": "1.3resigned1",
  "permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{60590abc-c6e8-4dc1-8e6f-3da73c3f4b58}"
    }
  }
}