I made this bookmarklet a while ago, but I use it all the time and it's *SO INCREDIBLY USEFUL* so I figured I'd share it here.
1) Make a new bookmark and name it "Deblur"
2) Copy/paste this Javascript code into the "address" field:
javascript:(function pxl8(){const s=document.createElement('style');s.innerHTML='img{image-rendering:pixelated;}';document.head.appendChild(s);for(let i=0;i<frames.length;++i){frames[i].document.head.appendChild(s);}})()