Examine source code of Blank Dark Tab

{
  "author": "Dan Mattera",
  "description": "Replace the New Tab page with a blank, dark tab",
  "chrome_url_overrides": {
    "newtab": "dark_tab.html"
  },
  "chrome_settings_overrides": {
    "homepage": "dark_tab.html"
  },
  "icons": {
    "48": "assets/48.png"
  },
  "manifest_version": 2,
  "name": "Blank Dark Tab",
  "version": "1.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{30bbc7f1-dcb7-4780-a7f8-bbd66f29d732}"
    }
  }
}