Bugzilla imposes a column-width limit, which usually makes it nicer to read paragraphs of text:

However when comments contain logging output including stack traces, the automatic wrapping can make it much harder to follow, e.g.:

So I wrote a tiny script that may be used with Tampermonkey (and probably other similar extensions), which makes Bugzilla use the full browser width:

// ==UserScript==
// @name         Wide Bugzilla
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Make Bugzilla use the full browser width
// @author       Gerald Squelart
// @match        https://bugzilla.mozilla.org/show_bug.cgi?*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    document.getElementById("main-inner").style.maxWidth = "100%"
})();

Assuming your screen is wide enough, the log is now much more readable:

If you don’t want to use Tampermonkey or similar, you may just open a Javascript console and enter document.getElementById("main-inner").style.maxWidth = "100%" for the same effect on the current page.

And of course, you could always copy the log to your favorite non-wrapping editor. 😉