Opera users received malicious update
In a post on the browser vendor's security blog, Opera employee Sigbjørn Vik has informed users of a security breach at the company during which unknown attackers have gotten control of an expired code signing certificate. The attackers used that certificate to sign malware and deliver it to thousands of Opera users through the browser's automatic updating function. Opera has advised users to update to a new version of its browser as soon as it is released.
You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump