chrome/common/extensions/docs/examples/api/downloads/download_links/manifest.json

{
  "name": "Download Selected Links",
  "description": "Select links on a page and download them.",
  "version": "0.1",
  "minimum_chrome_version": "16.0.884",
  "permissions": ["downloads", "<all_urls>"],
  "browser_action": {"default_popup": "popup.html"},
  "manifest_version": 2
}