User blog comment:Rappy 4187/Technical Update: August 31, 2015/@comment-24473195-20150831233511

So personal js has to be explicitly activated? That sounds like a wise move!

On that note, I think wikia has to seriously consider the damage old left-over scripts are doing to some wikias. I don't know if there's an automated way to detect this, but I think at least wikipedia has something. The issue is that some users are unable to make edits because ignorant admins have left javascripts with syntax/logical errors making the visual editor end up in an infinite loop and never load the full interface for editing.

In addition because of the security measures, even if admins wanted to remove the erronous code, it is currently impossible. The bigger problem is that most users and admins seem to be oblivious to this problem probably because the prefer the old classic editor. Maybe the code should be patched so that if it detects and error it reverts back to the classic editor, or simply usejs=0 for all anonymous and relatively new users.