Articles in “Firefox”

7 Tips for Fuzzing Firefox More Effectively

In the past half year I learned quite a lot about the different fuzzing approaches that security researchers and contributors use on Firefox. Although information on the subject should be … Read more

Why an outdated Java Plugin is so serious

Recently, Mozilla responded to an imminent threat to Firefox users who have an outdated Java plugin installed: Vulnerable versions of the plugin were blocked automatically (see blog post). Since then, … Read more

Update on Address Sanitizer

In a previous blog post, I outlined how the memory error detection tool Address Sanitizier (ASan) can be used with Firefox to find memory problems with a high degree of … Read more

DigiNotar Removal Follow Up

Earlier this week we revoked our trust in the DigiNotar certificate authority from all Mozilla software. This is not a temporary suspension, it is a complete removal from our trusted … Read more

Comodo Certificate Issue – Follow Up

This is a follow-up to the previous Mozilla report about the fraudulent certificates issued by Comodo last week. On 15th March 2011, a RA partner of the Comodo CA suffered … Read more

Firefox Blocking Fraudulent Certificates

Issue Mozilla has been informed about the issuance of several fraudulent SSL certificates for public websites. The certificates have been revoked by their issuer which should protect most users. This … Read more

Cooling Down the Firesheep

There have been a number of reports about a new Firesheep tool that exposes a weakness in website security, letting attackers snoop on people using public networks, steal their cookies, … Read more


One of the security enhancements included with Firefox 3.6.9 is support for the x-frame-options header. This optional header can be included within the HTTP response to instruct the client’s browser on whether the returned content is allowed to be framed by other pages. Read more