Examine source code of Saper Popup Pro

{
  "manifest_version": 3,
  "name": "Saper Popup Pro",
  "version": "1.2",
  "browser_specific_settings": {
    "gecko": {
      "id": "saper-popup-pro@xomek",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {},
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "saper.html",
        "saper.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}