Firefox Password Decryptor

A simple Go tool to decrypt and extract saved passwords from Firefox browsers.

How it works

Firefox stores encrypted passwords in logins.json and the decryption key in key4.db. This tool:

1. Locates your Firefox profile directory
2. Extracts the master key from key4.db
3. Decrypts password entries from logins.json
4. Outputs usernames, passwords, and associated URLs

The decryption process uses PBKDF2 key derivation and AES/3DES decryption depending on the encryption method used by Firefox.

Usage

Build and run:

git clone https://github.com/sohimaster/Firefox-Passwords-Decryptor.git
cd Firefox-Passwords-Decryptor
go build
./Firefox-Passwords-Decryptor

Command options

• ./Firefox-Passwords-Decryptor - Extract passwords (default)
• ./Firefox-Passwords-Decryptor -passwords - Extract passwords
• ./Firefox-Passwords-Decryptor -history - Extract browsing history
• ./Firefox-Passwords-Decryptor -history -passwords - Extract both

Example output

Firefox profile path: /home/user/.mozilla/firefox/abc123.default-release
Saved passwords: [
  {
    "Username": "john@example.com",
    "Password": "mypassword123",
    "URL": "https://example.com"
  }
]

Requirements

• Go 1.19+
• Firefox browser with saved passwords
• Read access to Firefox profile directory

Dependencies

• github.com/mattn/go-sqlite3 - SQLite database access
• golang.org/x/crypto - Cryptographic functions

License

MIT License - see LICENSE file.