Examine source code of Haachama language

{
  "manifest_version": 2,
  "name": "Haachama language",
  "short_name": "Haachamachama",
  "description": "Replaces the text 'to' with 'chama'.",
  "author": "Some Haaton",
  "version": "1",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "content_script.js"
      ],
      "run_at": "document_end"
    }
  ]
}