Looks like the part was placed using frame generator then published a second time into content center. There isn't a way to remove the browser pane from the UI, but it could be removed using the API. Not sure this is a good idea though as there are hidden attributes associated with the part from frame generator. These would still remain in the part which could potentially cause other problems. With regard to potential havoc derived from the tab, the biggest one I know of is the inability so see the model browser when creating drawings for frame generator parts. Best solution would be to find a copy of the original part pushed to CC before going through frame generator and republish it. If you want to throw caution to the wind and try to using the API to fix your problem, the code below should do the trick. Use at your own risk as there are potential other issues associated with this code.
Sub RemoveFrameGeneratorTab()
Dim doc As PartDocument
Set doc = ThisApplication.ActiveDocument
doc.BrowserPanes("Frame Generator").Delete
End Sub
