Examine source code of Fotor BG Remover

{
  "manifest_version": 3,
  "name": "Fotor BG Remover",
  "version": "1.0.3",
  "author": "Mr.Manit Treeprapankit",
  "description": "Download transparent PNG in HD format from Fotor BG Remover",
  "icons": {
    "16": "icons/icon-16x16.png",
    "32": "icons/icon-32x32.png",
    "64": "icons/icon-64x64.png",
    "128": "icons/icon-128x128.png"
  },
  "host_permissions": [
    "https://www.fotor.com/*",
    "https://u-static.haozhaopian.net/*"
  ],
  "permissions": [
    "webRequest",
    "downloads",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "fotor-bg-remover@8columns.com"
    }
  }
}