He could have the Google Toolbar, but these days it only can be added to IE. Google's chrome doesn't use it and Google hasn't kept up so Firefox won't allow the addition of an old version of the Google toolbar to a newer version of Firefox.

You should be able to uninstall the Google toolbar from your Control Panel (the Microsoft icon in the lower left and go to Control Panel and "Programs and Features" will let you uninstall it.

SRS