Examine source code of GameTab - Gaming wallpapers

{
  "manifest_version": 3,
  "name": "GameTab - Gaming wallpapers for your new tab",
  "author": "Tomas Chava",
  "description": "Turn every tab into a gaming wallpaper. Games screenshots, custom photos, live wallpapers & widgets.",
  "short_description": "Transform your tab with gaming wallpapers.",
  "version": "1.0.3",
  "permissions": [
    "storage"
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "host_permissions": [
    "https://steamcommunity.com/*",
    "https://*.steamstatic.com/*",
    "https://store.steampowered.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "gametab@tomaschava",
      "strict_min_version": "109.0"
    }
  }
}