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