Can you post a screenshot?

Thank you for responding

Please read:

• Use a Primary Password to protect stored logins and passwords
• Reset your Primary Password if you've forgotten it
• Firefox keeps asking me for Primary Password

Are you using Sync as this is a possible reason to ask for the Primary Password when you start Firefox ?

Using Sync is a possible reason to ask for the Primary Password at startup. This is because the credentials to login to the Sync account are stored in the Password Manager and you need to enter the Primary Password to unlock the passwords and connect/login to the Sync account.

• https://support.mozilla.org/en-US/kb/using-primary-password-sync