Fix filenames in Firefox favourites patch again
    
    @fmuellner 's changes in 7557912 seem to revert @mstransky 's
    changes from 624402d and 8c09aad , with no explanation. As this
    does seem to prevent Firefox showing up as a favourite, let's
    put it back to mstransky's way and see if that fixes it.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>