How to lock Mozilla Firefox with a password

Last Updated: February 8, 2016

In one of my article I have explained how you can lock Google Chrome browser with a password. This time I am writing an article for Firefox users, on how you can lock Mozilla Firefox with a password. We do not have in-built settings unlike Google Chrome to lock the browser. To lock Firefox you need to install a add-on. Master Password+ is an Add-on provided for Firefox users to make the browser password protected.

Benefits of Master Password+ Add-on

  • Whenever you open the browser, it will ask you for the password.
  • Apart from locking the entire browser, you can also lock the individual window of the browser.
  • You can lock the application on demand or you can set the specified time after which the application will gets locked automatically.
  • Option to ask for password on startup.

Steps to lock Mozilla Firefox with a Password

This add-on works with Firefox 3.6 – 39. To install this add on to your Firefox browser follow the below steps:

  • Open Mozilla Firefox, click on Tools -> Add-ons.
  • An Add-ons window will appear with a search box. Type in “Master Password” and hit enter, you will be listed with various add-ons. 
  • At the top of all you will see Master Password+ add-on. Click on that and install it.
  • After installing, it will ask you to restart the browser.
  • After restarting, you will see a lock icon in the address bar. Click on that, a window will open where you can set the password for your browser.make firefox browser password protected

How to ask for password on startup

  • Navigate to Tools->Add-ons->Extensions. On right side look for Master Password+ and click on Options.
  • A window will open, click on startup tab, it will list you with options where you can check the check box of “Ask for password on startup”.how to lock firefox browser with password
  • After this, every time you start Firefox browser it will prompt for to lock mozilla firefox with a password-min

READ ALSO: How to delete a particular website from history of Firefox

Master Password+ is the best add-on and the easiest way to lock Firefox browser and  adding lots of security to the browser.


  1. Only downside to this is that anyone who can acces your computer can easily go to Appdata\Mozilla\Firefox\Profiles\*profilename*\extensions and delete the folder of Master Password + extension.


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