limit download not limit browsing

i tried to limit download not limit brows so i put script on terminal
but problem is some user there traffic are High because the extension not on layer 7 and i dont know this extention
so, can i write script means marking any extension not marking on mangle then Determines on qeues

Please post your script as it is and give a printout of your existing queues, mangle rules, address lists and layer 7 address lists