Most of the browsers available today support the private browsing mode, which means none of the browsing history is saved by the browser when you use this mode. But this mode has to be manually activated when browsing. Autonito is an extension for Google Chrome which allows you to open websites automatically in Incognito (Private Browsing) without you having to do this manually. You can add the list of websites you want to open in this mode using the options.
Once you have added the list of websites in the options, the next time you open any of these sites, Autonito automatically skips opening the website in the tabs and opens a new Windows with Incognito (Private Browsing) mode enabled.
Autonito is a simple extension which does the job of activating Incognito, but the extension is not complete as there might be conflict with the way you open certain websites, for eg with or without www etc.