1. Download the Stylem extension: https://addons.palemoon.org/addon/stylem/
2. Add a new style, give it a name and paste in the following:
Code: Select all
html::after {
content: '';
display: block;
position: absolute;
top: 0;
left: 0;
height: 100vh;
width: 100%;
background-color: inherit;
z-index: -1;
}