Better Safe Than Sorry

Critical Firefox 3.5 Security Flaw

The newest Firefox, version 3.5, includes Tracemonkey, a new feature designed to speed up Javascript scripts. A flaw within Tracemonkey could allow attackers to remotely install evil software when users visit compromised Web sites.

A simple fix is available until the next patch fixes the vulnerability:

1. Open up a new Firefox window and type ‘’about:config‘’ (without the quotes) in your browser's address bar
2. In the ‘’filter‘’ box, type ‘’jit‘’ and a setting called ‘’javascript.options.jit.content‘’ will appear.
3. If the setting is set to ‘‘true’’ it means the option is enabled.
4. If it is, double-click on the setting. This should change the option to ‘’false‘’ disabling it.