Examine source code of unmedium

{
  "manifest_version": 2,
  "name": "unmedium",
  "version": "0.1",
  "description": "Makes medium usable.",
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "unmedium.js"
      ]
    }
  ]
}