VirusTotal extension does not provide any output or report after scanning:
Domain resolution is enabled, so VirusTotal will store reports for those domains only that have global DNS
If a domain does not resolve globally, disable resolving in VirusTotal > Settings > check Disable domain resolving option, click OK:
After that links to reports will be available.
If the report shows WHOIS information, it means that domain is fine and nothing suspicious was found.
VirusTotal works as follows: it does not scan actual files, it scans URLs only in domain's root directory. It cannot scan actual files for a domain as all information scanned under VirusTotal gets sent to VirusTotal directly and it is accessible to anyone. That's why VirusTotal cannot scan actual files for security reasons.