Examine source code of FireMoji

{
  "manifest_version": 3,
  "name": "FireMoji",
  "version": "0.1",
  "description": "Provides Slack/Discord-style emoji autocomplete in text fields across websites",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "firemoji@byap.com"
    }
  },
  "host_permissions": [
    "<all_urls>"
  ],
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "emoji-dataset.json"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Emoji Autocomplete Settings"
  }
}