Examine source code of New Tab Wallpaper

{
  "version": "0.1.1",
  "manifest_version": 2,
  "name": "New Tab Wallpaper",
  "short_name": "new-tab-wallpaper",
  "chrome_url_overrides": {
    "newtab": "data/newtab/index.html"
  },
  "background": {
    "persistent": true,
    "scripts": [
      "background.js"
    ]
  },
  "homepage_url": "https://mybrowseraddon.com/new-tab-wallpaper.html",
  "permissions": [
    "storage",
    "*://*.bing.com/*",
    "*://*.unsplash.com/*"
  ],
  "description": "Style your new tab - add beautiful and high-quality pictures to new tabs.",
  "browser_action": {
    "default_title": "New Tab Wallpaper",
    "default_icon": {
      "16": "data/icons/16.png",
      "32": "data/icons/32.png",
      "48": "data/icons/48.png",
      "64": "data/icons/64.png"
    }
  },
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png"
  }
}