Help setting up a kill switch

[stankovic]

I use firefox portable with my softether and I would like to set a kill switch. Normally when using regular firefox, I can easily set a kill switch using firewall properties (inbound and outbound connections), however this rule doesn't apply to firefox portable, I have tried numerous times but it just wouldn't work. I would be grateful if someone could suggest a kill switch setting or app that can help cut off all connection in case of IP leak.

[cedar]

Simply, you should remove the default gateway for ISP.