Examine source code of Bulk Delete for Spotify

{
  "manifest_version": 3,
  "name": "Bulk Delete for Spotify",
  "version": "0.1.2",
  "description": "Bulk unlike your Spotify Liked Songs: filter, preview, and remove many at once. Runs in your browser, no account needed.",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "host_permissions": [
    "https://open.spotify.com/*",
    "https://extensionpay.com/*",
    "https://*.extensionpay.com/*"
  ],
  "background": {
    "scripts": [
      "config.js",
      "ExtPay.js",
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Bulk Delete for Spotify",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://open.spotify.com/*"
      ],
      "js": [
        "engine.js",
        "adapter.js",
        "content.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://extensionpay.com/*",
        "https://*.extensionpay.com/*"
      ],
      "js": [
        "ExtPay.js"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "bulk-delete-spotify@bulkdeletetools.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}