Examine source code of LD Shortlinkener

{
  "manifest_version": 2,
  "name": "LD Shortlinkener",
  "description": "Adds a shortlink button on all Ludum Dare posts and games",
  "version": "1.1resigned1",
  "applications": {
    "gecko": {
      "id": "ldshortlinkener@kroltan.github.io"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://ldjam.com/*"
      ],
      "js": [
        "observe_shortlinks.js"
      ],
      "css": [
        "shortlinks.css"
      ]
    }
  ]
}