Examine source code of Contract Mate

{
  "manifest_version": 2,
  "name": "Contract Mate",
  "version": "1.0",
  "description": "Adds a quick access to deth.net editor to view contracts via etherscan",
  "icons": {
    "48": "icons/logo-48.png",
    "96": "icons/logo-96.png",
    "256": "icons/logo-256.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://etherscan.io/address/*"
      ],
      "js": [
        "mate.js"
      ]
    }
  ]
}