If you’re a Chrome user you can prevent unauthorized access to already opened Google Chrome browser with Lock Chrome extension, this extension even locks Operating system you need to log off or kill the Chrome process in the Task Manager.
If you ever want to leave your desk with lot of tabs opened in Chrome and worried about your colleagues may look what you are browsing in Chrome, Lock Chrome extension for Chrome is all you need.
After installing the Lock Chrome extension, click Lock Chrome icon on the toolbar, a popup dialog displays “Chrome is locked” from then you can’t close, access current tabs in Chrome or neither start new instance of Chrome. You’ve to kill all Chrome processes in the Task Manager or log off Windows to access Chrome again.
This extension locks Google Chrome browser, but doesn’t locks Windows system don’t know whether it locks Linux or not.