Examine source code of EDUS Websites

{
  "manifest_version": 3,
  "name": "EDUS Websites",
  "version": "1.0",
  "description": "Quick access to my websites",
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/1.png",
      "48": "images/2.png"
    }
  },
  "icons": {
    "48": "images/1.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "edus-websites@edus.lk"
    }
  }
}