Examine source code of New Tab HTML

{
  "manifest_version": 2,
  "name": "New Tab HTML",
  "short_name": "New Tab HTML",
  "description": "Customize the contents of your new tab page with HTML.",
  "version": "1.0.1",
  "icons": {
    "16": "icon.svg",
    "48": "icon.svg",
    "128": "icon.svg"
  },
  "homepage_url": "https://github.com/kmgb/new-tab-html",
  "minimum_chrome_version": "26.0.1428",
  "options_ui": {
    "page": "options.html"
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "chrome_settings_overrides": {
    "homepage": "newtab.html"
  },
  "permissions": [
    "storage"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'; img-src data:;",
  "browser_specific_settings": {
    "gecko": {
      "id": "{b449bdbe-cd6c-446b-809b-6debe8864238}"
    }
  }
}