Can you provide some screenshots, edited if necessary to remove sensitive information. This is a public website. * see [[Use a Master Password to protect stored logins and passwords]] * [[How do I create a screenshot of my problem?]] *When and why does this seem to popup ? *What happens if you do NOT enter the master passsword when requested ? <br/>That should give a clue as to why it is needed. If you are trying to log in to a website, and you navigated to that website then you will need to provide login credentials. If you have stored them and protected them with a master password Firefox will try to enter the details for you. Once you have set up the master password you will need to re-enter it again for instance when you add more login credentials, or if you view your password details in a new session. By the way do you use Firefox sync ? * https://www.mozilla.org/firefox/sync/ * https://support.mozilla.org/products/firefox/sync * If you do NOT use Sync your sync logs will be empty, check by keying in (or pasting in) to the addressbar '''''about:sync-log''''' and pressing the Enter key. Please check that.