Examine source code of Outlook Web Enhancement

{
  "manifest_version": 2,
  "name": "Outlook Web Enhancement",
  "version": "1.0.23",
  "description": "Make your email experience better with visual improvements such as removing advertisement messages and unnecessary clutter.",
  "icons": {
    "2048": "icons/outlook-2048-black.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "OutlookWebAppDarkTheme@WolfDev.com",
      "strict_min_version": "58.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://outlook.live.com/mail/*"
      ],
      "css": [
        "Outlook_StyleSheet.css"
      ]
    }
  ]
}