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Undefined variable: MutationObserver

I'm using Opera 12, and it does not support this specific functionality. It's specific to IE11, from what I can see.

This breaks functionality and highlighting does not happen on page refresh. I'm solving this by removing the following line:

   if (!EHH.gallery && !EHH.thumbnails)
       EHH.interceptMouseHover();

I'd like this issue to be properly solved or at least an option to disable this functionality so the script won't break on load.

MutationObservers are defined in the DOM4 specification, it's not proprietary to IE11. The problem is that you're using a really obsolete browser that doesn't support them (Opera support was added in version 15 after they moved to WebKit in 2013).

I've added a small fix that should remove that specific bug, but you should consider upgrading your browser if you can.

Thank you.