Hi Claribell - And g'day from Oz.

I am assuming you have the AddThis toolbar installed as an add-on in Firefox?

Open Firefox and click on [b:31hioe4a]Tools[/b:31hioe4a], from the drop down menu select [b:31hioe4a]Add-ons[/b:31hioe4a]. Now locate the entry for the AddThis toolbar in the list of add-ons, left click on it once and you will see some buttons appear. One of them will be the [b:31hioe4a]Uninstall[/b:31hioe4a] button. Just click on that button and the AddThis add-on will be uninstalled.

I haven't had anything to do with Mac computers, if that is all terribly wrong please post back and let us know.

Cheers.....Jim