Module – Integrate the PWA app into the Magento2 website

I want to integrate the PWA app into my Magento2 website. I have already tried the Tigren extension and made changes according to the document. After the installation I get errors when checking out.

I get the following errors:

Uncaught ReferenceError: firebase is not defined

require.js:1895 GET https://xxxx/pub/static/version1575442910/frontend/Smartwave/porto/en_US/@firebase/app.js net::ERR_ABORTED 404 (Not Found)

Uncaught Error: Script error for: @firebase/app

How can I fix these errors or is there another way to implement PWA Application?