Examine source code of Slamma Jamma

{
  "name": "Slamma Jamma",
  "version": "1.0",
  "description": "Replaces 'slam(s)' with more exciting phrases",
  "manifest_version": 2,
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "js": [
        "index.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_end"
    }
  ]
}