Examine source code of Matrix Calculator2

{
  "name": "Matrix Calculator2",
  "version": "1.0.0",
  "description": "calculate 3x3 matrix",
  "manifest_version": 3,
  "author": "gp-5",
  "action": {
    "default_popup": "index.html",
    "default_title": "Matrix calculator"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "camyblueman2021@gmail.com"
    }
  }
}