“JS checker” is disabled by default. You can enable it in Settings / General settings / Main.
General settings from the Settings drop-down menu.
Expand “Main” accordion in “General settings” pop-up window.
Set “JS checker” to
Click to confirm your settings.
There are two “No JS” parameters available:
Compare “No JS” stats for individual trades - if a certain trade is sending you an abnormal percentage of “No JS” traffic (compared to your other trades), you might decide this trade is a potential cheater.