The default_popup file in the manifest doesn't exist. Confirm it exists and then reload the extension.
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{
  "manifest_version": 3,
  "name": "AI Chat History Exporter",
  "version": "2.2.0",
  "description": "Export chat history from Grok, Gemini, ChatGPT and Claude — single chats or your entire history",
  "permissions": [
    "activeTab",
    "scripting",
    "downloads"
  ],
  "host_permissions": [
    "https://grok.com/*",
    "https://gemini.google.com/*",
    "https://chatgpt.com/*",
    "https://claude.ai/*"
  ],
  "action": {
    "default_popup": "popup_new.html"