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Fixed in Chrome, but not in FF …

That sucks, and it's been a problem for a long time. If you use https://www.piriform.com/ccleaner/download you'll always get the latest version.

v5.36.6278 64-bit doesn't delete cookies in Firefox 56.0.1 64-bit, either. I'm using a free product that's been doing its job for many years, but it's very unprofessional that there's no official statement about this serious product flaw. Instead, users and forum moderators are left to their own trying their best to help … but to no avail.