Examine source code of HTML Chaos

{
  "manifest_version": 2,
  "name": "HTML Chaos",
  "version": "1.0",
  "description": "Makes page elements move and become clickable targets in a simple arcade/clicker game.",
  "icons": {},
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "html-chaos.js"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "storage",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{64eceebc-1b4a-4bce-905e-7333e6d4cb40}"
    }
  }
}