Examine source code of A2Z Tools Extension

{
  "manifest_version": 2,
  "name": "A2Z Tools Extension",
  "version": "1.0",
  "description": "An extension to display tools from a2z.tools",
  "permissions": [
    "activeTab",
    "scripting",
    "https://a2z.tools/*",
    "storage"
  ],
  "host_permissions": [
    "https://a2z.tools/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{833aa4a4-4783-46ad-963b-899667bd6dc5}"
    }
  }
}