Examine source code of DarkCloud

{
  "name": "DarkCloud",
  "description": "SoundCloud Dark Theme",
  "version": "2023.11.7",
  "permissions": [],
  "icons": {
    "128": "darklogo.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://soundcloud.com/*"
      ],
      "js": [
        "background.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "default_title": "DarkCloud",
    "default_icon": "darklogo.png"
  },
  "manifest_version": 2,
  "web_accessible_resources": [
    "css_dark.css"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ebf8f713-a564-4511-93e4-4dfd24ffa08d}"
    }
  }
}