Examine source code of SoundCloud Playback Speed

{
  "manifest_version": 3,
  "name": "SoundCloud Playback Speed",
  "version": "2.0.2",
  "author": "@kenzn2",
  "description": "Adds a playback speed button to SoundCloud Web.",
  "homepage_url": "https://kenzn2.github.io",
  "browser_specific_settings": {
    "gecko": {
      "id": "soundcloud-playback-speed@kenzn2.github.io",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "host_permissions": [
    "https://soundcloud.com/*",
    "https://*.soundcloud.com/*"
  ],
  "content_scripts": [
    {
      "js": [
        "soundcloud-content-script.js"
      ],
      "matches": [
        "https://soundcloud.com/*",
        "https://*.soundcloud.com/*"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "soundcloud-script.js"
      ],
      "matches": [
        "https://soundcloud.com/*",
        "https://*.soundcloud.com/*"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_title": "SoundCloud Playback Speed"
  }
}