Hi Liebchen
I am Dave, an Independent Advisor, I will help you with this . . .
CryptnetUrlCache folders are actually part of the Internet Cache, they are created when you visit a website, then the next time you visit that website, the resources in that folder are loaded in the browser, and only the changes to the web page since you last visited the page are downloaded from the Internet, that makes it seem like the web page is loading faster
If you want to delete all of those, then clear out your web browser cache, however, as soon as you start using the browser again, then it will begin creating a new cache