Examine source code of IServ Dark Mode

{
  "manifest_version": 2,
  "name": "IServ Dark Mode",
  "version": "0.4.1",
  "author": "d43m0nhLInt3r",
  "description": "Dark Mode für IServ",
  "icons": {
    "48": "icons/isdm-48.png"
  },
  "browser_action": {
    "default_icon": "icons/isdm-48.png",
    "default_title": "IServ Dark Mode",
    "default_popup": "ui/index.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/iserv/*"
      ],
      "css": [
        "min.css"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "60.0"
    }
  }
}