Advanced Firefox Lock is a security tool for Firefox browser. With this extension you can lock your browse with a master key file or with a user name and password. This ensures that the browser is operated by you only.

When open the browser, this add-on asked you to locate the key file selected or entering the username and password, otherwise, the browser will not open. Similarly, this information will be asked again when you open a new window.

A padlock in the status bar lets you access the options; you can configure it by clicking on it – set password and user name or switched off it. For more security, you can also hide this icon. Get Advance Firefox Lock from here