Examine source code of transmission multi client

{
  "author": "sentriz",
  "description": "add torrents to multiple transmission servers",
  "manifest_version": 2,
  "name": "transmission multi client",
  "version": "0.0.4",
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "permissions": [
    "<all_urls>",
    "contextMenus",
    "notifications",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "transmission@senan.xyz"
    }
  },
  "applications": {
    "gecko": {
      "id": "transmission@senan.xyz"
    }
  },
  "background": {
    "page": "background.html"
  },
  "icons": {
    "16": "icons/logo-16.png",
    "24": "icons/logo-24.png",
    "32": "icons/logo-32.png",
    "48": "icons/logo-48.png",
    "64": "icons/logo-64.png",
    "128": "icons/logo-128.png",
    "256": "icons/logo-256.png",
    "512": "icons/logo-512.png"
  }
}