CVE-2006-6585: Mozilla Firefox

Medium severity, CVSS 6.4. EPSS: 1.1% chance of exploitation in the next 30 days.

The Extensions manager in Mozilla Firefox 2.0 does not properly populate the list of local extensions, which allows attackers to construct an extension that hides itself by finding its name in the list and then calling RemoveElement, as demonstrated by the FFsniFF extension. NOTE: it was later reported that 3.0 is also affected.

Affected products

• Mozilla Firefox: version 2.0 only; version 3.0 only

Published 2006-12-15. Last modified 2026-06-16.