Examine source code of ZendeskAutoRefresh

{
  "manifest_version": 3,
  "name": "ZendeskAutoRefresh",
  "version": "1.0",
  "description": "Auto refresh Zendesk ticket page without refreshing the entire page",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "icons": {
    "48": "icons/app_icon.png"
  },
  "action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "zendeskautorefresh@example.com"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.zendesk.com/agent/filters/*"
      ],
      "js": [
        "zendeskautorefresh.js"
      ]
    }
  ]
}