get handle

                IEnumerable<IntPtr> HandleBefore = Process.GetProcessesByName("firefox").Select(p => p.MainWindowHandle);
                
                // return false => IE, return true => 火狐
                bool browser_ = GetBrowserType(customer_name);
                if (browser_ == false)
                {
                    //ＩＥ
                    cd = initWebDriverIE(MY_PDF_DIRECTORY_BY_DATE);
                }
                else
                {
                    // 火狐
                    cd = initWebDriverFirefox(MY_PDF_DIRECTORY_BY_DATE);
                }

                IEnumerable<IntPtr> HandleAfter = Process.GetProcessesByName("firefox").Select(p => p.MainWindowHandle);

                browserHandle = HandleAfter.Except(HandleBefore);