---
id: 517
title: "Problem accepting self-signed SSL certificates on FF3"
source_domain: portswigger.net
source_url: "https://portswigger.net/blog/problem-accepting-self-signed-ssl-certificates-on-ff3"
published_at: "2008-08-20T11:00:00Z"
tags: ["burp-suite", "firefox", "proxy", "troubleshooting", "ssl-certificates"]
phying_url: "https://phying.com/item/517"
lang: en
---

# Problem accepting self-signed SSL certificates on FF3

## Summary

Firefox 3's stricter handling of invalid SSL certificates breaks proxy-based HTTPS interception with no visible add-exception option. The odd fix: set network.dns.disableIPv6 to true in about:config.

## Intelligence Metadata

- **Sources:** portswigger.net
- **Published:** 2008-08-20T11:00:00Z
- **Original:** https://portswigger.net/blog/problem-accepting-self-signed-ssl-certificates-on-ff3
- **Phying News:** https://phying.com/item/517