Greasemonkey script that removes the blackscreen that's shown when the viewer loses keyboard or mouse focus.

pixiv_novel_comic_nobs.js

// ==UserScript==
// @name        pixiv novel/comic anti-blackscreen
// @namespace   https://gist.github.com/3172387
// @description Removes the blackscreen that's shown when the viewer loses keyboard or mouse focus.
// @icon        http://comic.pixiv.net/favicon.ico
// @match       *://comic.pixiv.net/viewer/stories/*
// @match       *://novel.pixiv.net/viewer/stories/*
// @version     4
// @updateURL   https://gist.github.com/raw/3172387/pixiv_novel_comic_nobs.js
// @grant       none
// ==/UserScript==

function removeBlackscreen() {
    var div = document.getElementById("pauser");
    div.parentNode.removeChild(div);
}

removeBlackscreen();