Examine source code of GPA Calculator

{
  "manifest_version": 2,
  "name": "GPA Calculator",
  "version": "1.0.0",
  "description": "GPACalcu.com makes GPA and CGPA calculation simple, accurate, and fast for students around the world.",
  "browser_action": {
    "default_title": "GPA Calculator",
    "default_icon": "icons/icon-48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@gpacalcu",
      "strict_min_version": "91.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "91.0"
    }
  }
}