Examine source code of Putlerify

{
  "manifest_version": 2,
  "name": "Putlerify",
  "version": "1.0.2",
  "description": "Replaces all text instances of Putin with lowercase putler",
  "icons": {
    "48": "icons/icon.jpg"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "putlerify.js"
      ]
    }
  ]
}