When non-breaking text (such as IPv6) forces the left column to widen, this will move the right column along with it to prevent overlap.
// ==UserScript==
// @name [Konachan] Profile: Prevent Overlap
// @namespace Zolxys
// @description When non-breaking text (such as IPv6) forces the left column to widen, this will move the right column along with it to prevent overlap.
// @include /http://konachan\.(com|net)/user/show/\d+/?($|\?|#)/
// @version 1.0
// ==/UserScript==
var a = document.getElementById('content').childElements()[1];
var w = a.style.width;
a.style.width = '';
a.firstElementChild.style.width = w;