Examine source code of Link Bulk Downloader

{
  "manifest_version": 2,
  "name": "bulk-download",
  "version": "1.2.0",
  "description": "Bulk downloading links made easy!",
  "icons": {
    "48": "icons/bulkDownload48.png"
  },
  "permissions": [
    "activeTab",
    "downloads"
  ],
  "browser_action": {
    "default_icon": "icons/bulkDownload32.png",
    "default_title": "Bulk Download",
    "default_popup": "popup/bulkDownload.html"
  },
  "background": {
    "scripts": [
      "background_scripts/downloader.js"
    ]
  }
}