Fixed Position Bugzilla Bug Titles

userscript.js

// ==UserScript==
// @name           ScrollingBugTitlez
// @description    Pins the bug title header and other useful context so it's always visible when scrolling longer bugs
// @include        https://bugzilla.mozilla.org/show_bug.cgi?id=*
// @author         Stuart Philp
// ==/UserScript==

/*
    Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/licenses/publicdomain/
*/


var bugzillaBody = document.querySelector("#bugzilla-body");
var elementPosition = document.querySelector("section.module");
bugzillaBody.addEventListener('scroll', function() {
  var rect = elementPosition.getBoundingClientRect();
  if (bugzillaBody.scrollTop > rect.top) {
    elementPosition.style.position = "fixed";
    elementPosition.style.width = "100%";
    elementPosition.style.left = 0;
    elementPosition.style.top = '44px';
  } else {
    elementPosition.style.position = "static";
  }
});