Test if your browser supports SSLv3
You can use web services like Qualys SSL Labs.
https://www.ssllabs.com/ssltest/index.html
Oher tools:
https://pentest-tools.com/network-vulnerability-scanning/ssl-poodle-scanner
Using nmap:
nmap -p 443 –script ssl-enum-ciphers your.domain.com
Source: http://disablessl3.com/#test