Examine source code of Zen Space Tab

{
  "name": "Zen Space Tab",
  "description": "Customize this new tab extension and let Zen Space Tab get you back in focus.",
  "version": "1.0.3",
  "icons": {
    "16": "/images/16.png",
    "32": "/images/32.png",
    "48": "/images/64.png",
    "64": "/images/128.png"
  },
  "short_name": "Zen Space Tab",
  "chrome_url_overrides": {
    "newtab": "html/new_tab_page.html"
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "*://zenspacetab.com/*"
  ],
  "manifest_version": 2,
  "background": {
    "scripts": [
      "bg.js"
    ]
  },
  "web_accessible_resources": [
    "/images/16.png",
    "/images/32.png",
    "/images/64.png",
    "/images/128.png",
    "html/new_tab_page.html"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{894e1246-6ba3-4941-a312-9b344052988b}"
    }
  }
}