Examine source code of Dark Mode REDMINE

{
  "manifest_version": 3,
  "name": "Dark Mode REDMINE",
  "version": "1.0.3",
  "description": "Переключатель темного режима",
  "permissions": [
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://z.cdnvideo.ru/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "content.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon.png",
      "48": "icon.png",
      "128": "icon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{12345678-5815-1418-0981-1234567890ab}"
    }
  }
}