Strange single semi-colon in Footer: how to get rid of it?

Hello! I see a single semicolon in the last line of the footer. It appears on all pages. I can locate it using the Firebug (it disappears when I delete it in Firebug, but cannot save the change). However, I cannot find out where I can delete it. I know it's only a little thing, but it disturbs me that it is there nevertheless. Any advice please?

Janine