Examine source code of Click Dictionary

{
  "manifest_version": 2,
  "name": "Click Dictionary",
  "version": "1.0.1",
  "description": "Get word definition when double clicking on it.",
  "permissions": [
    "*://api.dictionaryapi.dev/api/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}