I want to change my Master password or remove it but I cant. If I try to uncheck the checkbox that says "Use a master password" It asks for the current password and when I enter it and click OK nothing changes. When I try to change the password, after typing in the old and the new passwords and clicking OK. I get an "Unable to change password" pop-up.

Please see this support article:
https://support.mozilla.org/en-US/kb/reset-your-master-password-if-you-forgot-it

mohannad_m said

I want to change my Master password or remove it but I cant. If I try to uncheck the checkbox that says "Use a master password" It asks for the current password and when I enter it and click OK nothing changes. When I try to change the password, after typing in the old and the new passwords and clicking OK. I get an "Unable to change password" pop-up.

Please see this support article:
https://support.mozilla.org/en-US/kb/reset-your-master-password-if-you-forgot-it

This is helpful but I cant risk deleting all the stored passwords and data. maybe I will keep it for now. I wish there was a simpler way to change it. Thanks for your reply.

More and more of the sensitive, valuable things in our life are guarded through password-protected online accounts — love letters, medical records, bank accounts and more. Web sites use login procedures to protect those valuable things. As long as someone can’t log into your account, they can’t read your email or transfer money out of your bank account. As we live our lives online, how should we protect our logins?

tl;dr:

• Use random passwords, and use a different password for every site
• Use a password manager to make creating and remembering passwords easier
• Make your answers to security questions just as strong as your passwords
• Use “two-factor authentication” wherever you can
• Pay attention to the browser’s security signals, and be suspicious

https://blog.mozilla.org/internetcitizen/2017/01/25/better-password-security/