Examine source code of Web3 Portal

{
  "manifest_version": 2,
  "name": "Web3 Portal",
  "description": "Welcome to Extension Desktop",
  "version": "1.4",
  "browser_specific_settings": {
    "gecko": {
      "id": "sg-river@browserweb.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "browser_action": {
    "default_title": "Open My Window",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "tabs"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "web_accessible_resources": [
    "index.html",
    "assets/*"
  ]
}