var
  I: Integer;
begin
  // navigate with your TChromium to some URL first, then you can list plugins...
  for I := 0 to CefGetWebPluginCount - 1 do
    ShowMessage(
      CefGetWebPluginInfo(I).Name + sLineBreak +
      CefGetWebPluginInfo(I).Path + sLineBreak +
      CefGetWebPluginInfo(I).Description
    );
end;