Like jorondow, I installed the script (using Firefox 4) and tried refreshing the browser, and tried closing and rebooting too. Nothing. Whether or not I'm logged into Google, doesn't work.

Using firefox 3.6.3 for mac here. not working at all :(

Script installed, refreshed browser and even closed and reboot app, but nothing.

This script is really great if you think the space to the right of your google results is wasted.

It just works.