CODE:

win w[5];
int k=0;
external(INT, "ShellExecute", "ShellExecuteA", "Shell32.dll");

loop(5)
{
ShellExecute(0, "open", "firefox.exe", "-private", "", 5);
while(window ("Google - Mozilla Firefox", "MozillaWindowClass", -1)==0 && //По умолчанию если уже открыты окна
window ("Mozilla Firefox", "MozillaWindowClass", -1)==0) sleep(100);//Стартовая страница если первых запуско окна

if (window ("Google - Mozilla Firefox", "MozillaWindowClass", -1)!=0)w[k]=window ("Google - Mozilla Firefox", "MozillaWindowClass", -1);
if (window ("Mozilla Firefox", "MozillaWindowClass", -1)!=0)w[k]=window ("Mozilla Firefox", "MozillaWindowClass", -1);

pause(1000);

ShellExecute(0, "open", "firefox.exe", "-private http:/"+"/kibor-bot.com/forum/topic.php?forum=5&topic=1318&v=l#1558440934", "", 5);

while(window ("Google - Mozilla Firefox", "MozillaWindowClass", -1)!=0 ||
window ("Mozilla Firefox", "MozillaWindowClass", -1)!=0) sleep(100);
}

Несколько мазил.