Examine source code of Kosmofier

{
  "manifest_version": 2,
  "name": "Kosmofier",
  "version": "1.0",
  "description": "Replaces Kos or all similar words on the webpage with \"Kos, or some say, Kosm\".",
  "icons": {
    "48": "icons/kos-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "kosmofier.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{858f0e15-4efa-40f1-b6fb-31622731b708}"
    }
  }
}