On firefox 55.0.3 64bit, when I have enabled uBlock Origin or Adblock, I have strange initalization issue in version 2017.2.621
The below function from kendo.all.js is throwing exception: root is null. This happens when addon is enabled even if site is whitelisted. I need to disable addon totally to make editor work. I can reproduce issue on Dojo or demo site. I believe previous version didn't have this issue.
childrenCount = root.childNodes.length;
textChild = childrenCount && root.firstChild.nodeType == 3;
textChild && (childrenCount == 1 || childrenCount == 2 && dom.insignificant(root.lastChild));