Cloned from: https://github.com/firefox-devtools/debugger/issues/8293
Create a variable like this:

var text = `
Lorem Ipsum is simply dummy text of the printing and typesetting industry.

Lorem Ipsum has been the industry's standard dummy text ever since the "1500s", when an unknown printer took a galley of type and scrambled it to make a type specimen book.

\t\t\tIt has survived not only five centuries, but also the leap "into" electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum
`;

• If you use console.log(text); looks ok
  See attached screenshot

• Using debugger, this variable is unreadable
  See attached screenshot

If this variable contains a buch of html code, the debugger is unnusable

Honza