Examine source code of Unicode Font Converter

{
  "manifest_version": 3,
  "name": "Unicode Font Converter",
  "version": "1.0",
  "description": "Convert text to selected Unicode fonts",
  "permissions": [
    "tabs"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7f8d3a12-9b4e-4c2d-a5e9-1b3f6d789012}",
      "strict_min_version": "109.0"
    }
  }
}