The web browser functioning off a removeable drive is a joke. The same thing is easily accomplished by tweeking the browser or by making other mods. For example, since blocking cookies prevents access to many sites, I allow ALL cookies but have modified the cookie file to be read only - all changes to it are discarded when the session is closed. I leave some cookies in the file for sites that I want to remember me before changing to read only.
And there is no such thing as private web surfing - at least one entity knows what you are up to. If not the ISP, then the company one is using as an anonymizer.
The closest thing I found to completely private surfing is
rewebber because they are not under the jurisdiction of tforchsA nhoJ. And the transmission is encrypted as it leaves your computer so your ISP can't see it and the web pages are encrypted as they are sent back to you so your ISP can't see the results either (your PC decrypts them then feeds the output to the browser).