У вашего броузера проблема в совместимости с HTML5
How to enable sv_clienttrace 999999999 in cs 1.6
1- if you host the server from the minemenu of the game then open ur console and type
bind mouse1 "+attack;sv_clienttrace 999999999"
2- if you host the server by using HLDS then add this line:
bind mouse1 "+attack;rcon sv_clienttrace 999999999"
hope its work and thank you :)