Examine source code of Hover Word Expander

{
  "manifest_version": 2,
  "name": "Hover Word Expander",
  "version": "1.0",
  "description": "Learn English effortlessly! Hover over any word to see its definition, pronunciation, and a fun example sentence. Save words to your personal vocabulary notebook.",
  "permissions": [
    "activeTab",
    "storage",
    "https://api.dictionaryapi.dev/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{60f13ee5-526a-48ab-899d-c0b73c69675c}"
    }
  }
}