Examine source code of OkoElks

{
  "manifest_version": 2,
  "name": "OkoElks",
  "version": "1.0",
  "description": "This addon replaces images with pictures of Oko's Elks. What isn't there to love",
  "applications": {
    "gecko": {
      "id": "jid1-cah420R4K9NQmQx8Ciug@jetpack"
    }
  },
  "icons": {
    "128": "images/oko.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "elkify.js"
      ]
    }
  ],
  "homepage_url": "https://github.com/cah420/OkoElks",
  "web_accessible_resources": [
    "images/elk0.jpg",
    "images/elk1.jpg",
    "images/elk2.jpg",
    "images/elk3.jpg",
    "images/elk4.jpg",
    "images/elk5.jpg",
    "images/elk6.jpg",
    "images/elk7.jpg",
    "images/elk8.jpg",
    "images/elk9.jpg"
  ]
}