Is it possible to run Firefox in batch mode and get a list of site problems in text form?

Question

Web development

There is a site that needs to be automatically checked by the web client for errors.
Who uses what for these purposes?
Right now I'm using PhantomJS, but it only catches web errors (no details) and JavaScript.
Firefox has a wonderful Web Console (opened by Ctrl+Shift+K) where it logs
web, CSS, JS, security, etc. errors.
But it is interactive, i.e. you cannot run Firefox in batch mode and download this list from it to a text file.
Or is it possible?