In an earlier version I set it up so that opening a tab opened about:blank and the title was blank via a simple Greasemonkey script: // ==UserScript== // @name blank // @grant none // @include about:blank // ==/UserScript== document.title = "\u2800"; Now not only did Firefox restrict what could be set on opening a blank tab, (which required me to install an add-on), the Greasemonkey script doesn't work on about:blank anymore.