FireFox - unwanted tool-bar

I just recieved a Yahoo tool bar in Firefox - thanks but I didn’t ask for it!

To remove the b’'t’rd, in Forefox, go to Tools > Add-Ons and click Uninstall
Close all sessions of Firefox, and re-start

Yes you do, it will apply once you have restarted firefox not immediatlly aswell.
I just removed a google one which crept its way on my new rig.