Safari crashes when I click the "Manage Website Data" button under Privacy

Thanks for visiting the Apple Support Communities, iTim2009,

If Safari is unexpectedly quitting when you try to clear the website data, we would suggest seeing if the issue persists after turning off the "Prevent cross-site tracking" setting in Safari Preferences: Prevent cross-site tracking in Safari on Mac - Apple Support

If the issue persists after that, we'd recommend getting in touch with Apple Support directly here: Get Support.

Have a good day.

Post the crash log, although I seriously doubt it will reveal any actionable information. You may need to use the "additional text" icon below:

You already did everything reasonable in an effort to solve the problem, and more. I encourage you to contact Apple: Get Support. It's an unusual problem, which means their engineers might actually be interested in taking an active part in tracking it down.

Given your description and everything you tried, I suspect something is amiss with some obscure Safari setting in iCloud. Those settings are obviously not saved on your Mac, which is the reason purging every Safari folder and Safari-related file didn't help.

Open  (Apple menu) > System Preferences... > Apple ID

Under Apps on this Mac using iCloud, find Safari. Assuming it is already selected, de-select it. Test.

The report bears all the markings of defective software. It's unusual since I have not heard of Safari crashing under the circumstances you describe, but not many people know about "Manage Website Data" or what it's for.

Please let me know what Apple has to say. I strongly suspect they will take an active interest in your concern, and will pass the crash report along to Engineering. Then, things will appear to fall into a black hole. You will hear nothing from them, and you may conclude you're being ignored, but it's nearly certain they will quietly incorporate a fix and release it in a future macOS update. That may take weeks or months so be patient.

They offered two solutions: 1) create a new user account and start over from there, or 2) erase my Mac, not restoring from a Time Machine backup, and start over.

I would suggest another solution, but having marked your question as "Solved" I will leave it at that.

Tried to delete everything related to Safari in my current user account. No change.

Well, at least cookies and data are all cleared, don't need the button anyway.

It's a problem that definitely needs to be addressed, but have to wait I guess.