Examine source code of Outlook Support Extension

{
  "browser_specific_settings": {
    "gecko": {
      "id": "outlook-extension@kitamura.jf7",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "manifest_version": 3,
  "short_name": "outlook-extension",
  "name": "Outlook Support Extension",
  "version": "0.1.0",
  "description": "Outlook補助 Extension",
  "content_scripts": [
    {
      "matches": [
        "https://outlook.office.com/*"
      ],
      "css": [
        "style.css"
      ]
    }
  ]
}