Examine source code of Instastool

{
  "browser_action": {
    "default_icon": "img/icon_128.png",
    "default_popup": "html/popup.html",
    "default_title": "Instastool"
  },
  "description": "Download Instagram Videos, Images, GIFs, IGTV and almost every media for free from instastool.com",
  "icons": {
    "16": "img/icon_16.png",
    "128": "img/icon_128.png"
  },
  "manifest_version": 2,
  "name": "Instastool",
  "version": "1.1"
}