Download the following Firefox extension:
CustomizeGoogle v 0.36
If you use Google, and you accept it's cookie, you should give some thought to the implications, both good and potentially bad : this page tries to help you do that, together with an easy way to anonymize it without missing out on its benefits.
Article: Anonymizing Google's Cookie at:
http://www.imilly.com/google-cookie.htm
This article has tools for anonymizing Google's cookie for other browsers!
You may have to either restart Firefox or Reboot, and to use it, simply use Tools Pull-down, select Customize Google Options..., then select Privacy tab and check Anonymize the Google Cookie UID
Avoid the possibility of Google building up a cohesive profile about you. This does not block your access to Google Account services, such as GMail. Some services may be affected. For example, in Google Groups the list of 'Recently visited' groups becomes empty.
Click Ok.
-- Tom