For those who don't know, this is entirely client side. If you want, you can delete the overlay (single div) from the dom and remove an 'overflow: hidden' inline style, and continue to scroll the page and look at pictures without logging in.
1. https://github.com/gorhill/uBlock/wiki/Static-filter-syntax#...
javascript:(function(){(function () {var i, elements = document.querySelectorAll('body *');for (i = 0; i < elements.length; i++) {if (getComputedStyle(elements[i]).position === 'fixed') {elements[i].parentNode.removeChild(elements[i]);}}})();document.querySelector('body').style.setProperty('overflow','auto','important'); document.querySelector('html').style.setProperty('overflow','auto','important');})()