Private Browsing Portable

Private Browsing is an enhanced privacy mode app that utilizes your existing copy of Mozilla Firefox, Portable Edition. It has specialized settings, a flash blocker, a privacy-enhancing blocklist, a separate profile and a custom theme so you can easily distinguish it from your main Firefox Portable profile. It even has its own separate set of bookmarks. It's basically a more-advanced private browsing feature than those included in major browsers that can even be customized further by advanced users.