Examine source code of Instant Definition Popup

{
  "manifest_version": 2,
  "name": "Instant Definition Popup",
  "version": "1.0",
  "description": "Show word meanings directly on the page.",
  "permissions": [
    "activeTab",
    "storage",
    "https://api.dictionaryapi.dev/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7cfbc8a5-9677-4af0-b9e0-0b208802877d}"
    }
  }
}