simplest way to remove all the styles in a page

Question

I need to remove all the style definitions in a page using javascript, to obtain the same result as doing View > Page Style > No Style in Firefox. Which i

Answer 1

Actually, document.querySelectorAll returns NodeList which has forEach method.

document.querySelectorAll('link[rel="stylesheet"], style')
  .forEach(elem => elem.parentNode.removeChild(elem));