helm/config/qutebrowser/greasemonkey/let-there-be-light.user.js

// ==UserScript==
// @name        Let there be Light
// @description Change page background to white.
// @version     0.1
// @author      Ingvix
// @include     *
// ==/UserScript==

// Needed to counterbalance my colors.webpage.bg hack to prevent the blinding
// flash of white between page loads.
(function () {
    'use strict';

    function _bg(element) {
        return window.getComputedStyle(element).backgroundColor;
    }

    if (_bg(document.documentElement) === "rgba(0, 0, 0, 0)" &&
        _bg(document.body) === "rgba(0, 0, 0, 0)") {
        var sheet = window.document.styleSheets[0];
        sheet.insertRule('body { background-color: white; }', sheet.cssRules.length);
    }
})();