Via the excellent TamperData plugin I just noticed that my Firefox browser was sending a HTTP request (with a cookie!) to http://toolbarqueries.google.com for every page my browser loaded, even when the toolbar is not visible.
It is bad enough that a user interface component would remain active even when not visible, but even worse that it is silently doing so. And what’s that cookie for?

Isn’t it diffucult to trust a software vendor that produces a component like this, no matter how they justify what it is doing? Bad, invasive, sneaky, dishonest software. Uninstall the Google Toolbar (if you have it installed) by making it visible (briefly!), clicking on the Google logo on the toolbar, choosing Help and then Uninstall…