Examine source code of Min Tab Clock

{
  "manifest_version": 2,
  "name": "Min Tab Clock",
  "version": "1.0",
  "author": "Scott Warner",
  "description": "Adds a clock to the about:blank page.",
  "chrome_url_overrides": {
    "newtab": "blank-page.html"
  },
  "chrome_settings_overrides": {
    "homepage": "blank-page.html"
  },
  "icons": {
    "48": "icons8-new-window-48.png",
    "96": "icons8-new-window-96.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons8-new-window-16.png",
      "32": "icons8-new-window-32.png"
    },
    "default_title": "Min Tab Clock"
  },
  "permissions": [
    "storage"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "match_about_blank": true,
      "matches": [
        "about:blank"
      ],
      "js": [
        "newtabclock.js"
      ]
    }
  ]
}