Examine source code of SoundDark (DEPRECATED)

{
  "manifest_version": 3,
  "name": "SoundDark",
  "version": "0.4",
  "description": "A better Dark theme for SoundCloud",
  "icons": {
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "js": [
        "sounddark.js"
      ],
      "matches": [
        "https://soundcloud.com/*"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "sounddark.css"
      ],
      "matches": [
        "https://soundcloud.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "sounddark@michioxd.github.io"
    }
  }
}