Examine source code of Art Tab

{
  "name": "Krekib",
  "description": "An artwork before each internet adventure.",
  "version": "1.0.0",
  "manifest_version": 2,
  "permissions": [
    "storage",
    "https://*.krekib.com/"
  ],
  "icons": {
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_action": {
    "default_popup": "popup/popup.html"
  },
  "chrome_url_overrides": {
    "newtab": "index/index.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "chrome_style": true
  }
}