Use a Primary Password to protect stored logins and passwords
Setting a Primary (formerly "Master") password in Firefox is helpful if your share your computer with others. We'll explain how it works.
Use a Primary Password with Sync
Learn how to use Sync in Firefox with a Primary Password (formerly known as a “Master Password”) for extra protection.
Firefox keeps asking me for Primary Password
How to resolve an issue where Firefox asks for a Primary (formerly "Master") Password if you have AVG or Eset Internet Security installed.
Reset your Primary Password if you've forgotten it
You can reset your Firefox primary (formerly "master") password if you forgot it. Warning: This removes all saved usernames and passwords.