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Firefox 149 adds built-in free VPN with 50GB monthly data
(www.omgubuntu.co.uk)
This is a most excellent place for technology news and articles.
They don't know the URL but they know the IP address so ... yes, they also can get the URL
IP addresses do not map to URLs.
They might map to domains, but not necessarily.
You cannot reliably get the URL from an IP, there's no direct mapping, especially with shared hosting.