Comment by Tepix

Use this bookmarklet to rotate the hue by +20. You can use it multiple times in a row:

    javascript:(()=>{const e=document.documentElement;let n=parseFloat(e.dataset.hue||"0")+20;if(n>=360)n-=360;e.dataset.hue=n;e.style.filter=n?"hue-rotate("+n+"deg)":""})()

It works best if you add it to your bookmark shortcut list.

Sorry for the previous one, it was too long.