I have seen this in an older question but don't quite understand what to do or where to add this next instruction and do I create a folder or just paste it in as text in the profile folder?

"On Mac you can use the TextEdit utility to create the userContent.css file as a plain text file."

Hi, are you referring to this: https://support.mozilla.org/en-US/questions/1337600#answer-1415773

I have a site about userChrome.css files if you need to set one up from scratch: https://www.userchrome.org/how-create-userchrome-css.html

But it might be simpler to try this program: https://github.com/kspearrin/ff-password-exporter