The issue is related to the mechanism of loading DLL libraries in the Firefox web browser for Windows. It is associated with the absence of quotes in writing elements or search paths. Exploitation of this issue could allow an attacker to cause a denial of service. If Firefox was installed to a world-writable directory, a local privilege escalation could occur when Firefox searched the current directory for system libraries. However, the install directory is not world-writable by default. This bug only affects Firefox for Windows in a non-default installation. Other operating systems are unaffected.