Examine source code of SL - Download Manager

{
  "manifest_version": 2,
  "name": "Download Manager",
  "version": "0.2.1resigned1",
  "description": "File Download Manager",
  "permissions": [
    "downloads",
    "downloads.open",
    "tabs",
    "activeTab",
    "runtime"
  ],
  "background": {
    "scripts": [
      "downloader.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c166c73d-6a24-4a6c-9aef-595636358ab8}"
    }
  }
}