Not that I rely on online browser based security tests to tell me if I'm "secure" or not,
...but for shits & giggles, here are my results from:
http://bcheck.scanit.be/bcheck
Browser Security Test Results
Dear Customer,
The Browser Security Test is finished. Please find the results below:
High Risk Vulnerabilities 0
Medium Risk Vulnerabilities 0
Low Risk Vulnerabilities 0
FireFox here.