The only difference is that https-everywhere is trying to play nice and works only on some web sites that have been tested with the extension. It doesn't work "

The only difference is that https-everywhere is trying to play nice and works only on some web sites that have been tested with the extension. It doesn't work "everywhere". Panic Mode, on the other hand, forces the user over SSL regardless if the other end supports or doesn't support SSL. This means that Panic Mode wont work for general browsing because you will quickly realise that most web sites do not support SSL or use self-signed certificates, etc. However, my personal opinion is that sometimes it is better for things to be broken than to be sorry. If a web site breaks while Panic Mode is on and you care about your privacy, either something fishy is going on or the site is simply not good for this. Panic Mode is more like poor man's VPN tunnel. Https-everywhere is good but can be fooled in some situations to leak sensitive information.