Removing Shims of Native Javascript

We’re trying to add a new chat service to our website and it is only working sporadically. Their support says we need to remove shims of native javascript. Is that safe to do?


I’m struggling to figure out where this would be shimmed. addEventListener and removeEventListener have been supported in every browser for 10+ years. Concrete CMS only supports fairly modern browsers, so I’d be really surprised if there’s something in Concrete that contains a JavaScript shim for those methods.

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