Examine source code of Splashtab

{
  "manifest_version": 2,
  "name": "Splashtab",
  "version": "1.0.1",
  "description": "Fill the new tab page with a random image from unsplash.com",
  "chrome_url_overrides": {
    "newtab": "splashtab.html"
  },
  "icons": {
    "48": "icons/ic_photo_camera_black_48px.svg",
    "98": "icons/ic_photo_camera_black_48px.svg"
  },
  "browser_action": {
    "default_icon": "icons/ic_photo_camera_black_48px.svg",
    "default_title": "Splashtab",
    "default_popup": "popup/config.html"
  }
}