Information Prominence

Generally for every user initiated action the system should provide how to rollback the action. But, if the information is not prominent,though placed right in front, the user fails to notice and tries to look for it from where the action is initiated, and in this case the turn off InPrivate browsing option is not available under the Tools tab. The confusion begins in the user's mind and one of the most important 'E' of Usability, i.e., ease of use spirals down to drastic levels. It's strange to find this type of problem with one of the product giants like, Microsoft.

Look at the text marked inside the red rectangle in the figure, this information is what user would be looking to stop the inprivate browsing, but would not notice it though placed on the page because it's not prominent enough.

In fact, had MS put this info in a colored rectangle as I did would have been more usable and intuitive.

Simple things addressed intuitively are easily understood and make the products usable and pleasure to use. 'Don't make your users think'.