Examine source code of SJ's Password Generator

{
  "browser_specific_settings": {
    "gecko": {
      "id": "souravjoshimusics@gmail.com",
      "strict_min_version": "42.0"
    }
  },
  "name": "Password Generator",
  "description": "Password Generator made by Sourav Joshi",
  "version": "0.1.0",
  "manifest_version": 3,
  "icons": {
    "32": "Images/32png.png",
    "48": "Images/48png.png",
    "128": "Images/128png.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "32": "Images/32png.png",
      "48": "Images/48png.png",
      "128": "Images/128png.png"
    }
  },
  "options_page": "popup.html",
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "tabs"
  ]
}