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What is your question? Where are you seeing this? More information would help.

1. Restart your Mac.

Launch Safari holding the shift key down.

2. Contact Intercom if you are Intercom.co developer.

I have the same problem, every time I open Safari this warning appears. I have no account in intercom. Once i dismiss the warning everythimg seems to work fine.

Try Safari/History/Show all history to see if you can find the related web site.

Safari/Preferences/Advanced - enable the Develop menu, then go there and Empty Caches. Quit/reopen Safari and test.

Thank you for posting the solution. I might help others.

Thanks, the "offending" extension, in my case, was padlet mini.

Exactly the same here PadletMini the problem.