Inject Script - main.js

[zikrome]

I have searched on here and can't find what to do with main.js for use with Inject Script?
The original main.js throws the error "console in undefined" - What can I add to main.js so that I can process a prompt automatically by running "Preferences" -> "Inject Script" ?

[lencx]

If you lack programming experience, please do not modify the main.js content randomly, it may lead to web page errors.

[zikrome]

I have over 10 years of programming experience. There is no guide as to what should go in main.js
Even the original main.js throws an error when you run inject script

[lencx]

Please provide screenshots, main.js and console (Help -> Toggle Developer Tools -> console).

[zikrome]

Please provide screenshots, main.js and console (Help -> Toggle Developer Tools -> console).

I cleared console before beginning, ran inject script, and then checked console. Screenshots attached. I also updated first.