Examine source code of Emoji Highlighter

{
  "manifest_version": 2,
  "name": "Emoji Highlighter",
  "version": "1.0",
  "description": "Automatically adds an emoji after a specific keyword in the text to make writing more fun.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a642d6d2-1419-4710-b0eb-79e6e36a614b}"
    }
  }
}