Examine source code of archive-dl

{
  "manifest_version": 2,
  "name": "archive-dl",
  "version": "0",
  "description": "adds metadata xml links to stream_only archive.org pages",
  "icons": {
    "48": "icons/archive-dl_48.png",
    "96": "icons/archive-dl_96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.archive.org/*"
      ],
      "js": [
        "archive-dl.js"
      ]
    }
  ]
}