Não me lembro da minha senha mestra do Firefox
Existem duas opções:
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Use FireMaster para recuperar sua senha ou
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Redefina sua senha mestra.
Veja abaixo as instruções.
Opção 1: use FireMaster para recuperar sua senha
Sobre o FireMaster
FireMaster is the First ever tool to recover the lost Master Password of Firefox.
Master password is used by Firefox to protect the stored login/password information for all visited websites. If the master password is forgotten, then there is no way to recover the master password and user will lose all the passwords stored in it.
However you can now use FireMaster to recover the forgotten master password and get back all the stored Login/Passwords.
FireMaster supports Dictionary, Hybrid, Brute-force and advanced Pattern based Brute-force password cracking techniques to recover from simple to complex password. Advanced pattern based password recovery mechanism reduces cracking time significantly especially when the password is complex.
FireMaster is successfully tested with all versions of Firefox starting from 1.0 to latest version v47.0
...
License : Freeware Platform : Windows XP, 2003, Vista, Windows 7, Windows 8, Windows 10
Source FireMaster - A ferramenta de recuperação de senha do Firefox Master
Veja o link da fonte para instruções completas
Opção 2: redefinir sua senha mestra
Using the Master Password feature, you can protect all of your locally stored usernames and passwords with a master password. If you have forgotten your master password, you must reset it.
Warning: Resetting your master password will remove all of your saved usernames and passwords.
In the Firefox location bar, enter the following location:
chrome://pippki/content/resetpassword.xulPress Enter.
The "Reset Master Password" page will appear. Click the Reset button, to reset your master password.
Fonte Redefina sua senha mestra se você esquecido