NOTE: Tested and Tried with Firefox 3.0.14 on Ubuntu 9.04

 

Answer:

  • Open Firefox

  • Click on Edit->Preferences (In Windows this will be under Tools)Edit Preferences

  • Click on the Security Tab

    Security

  • Underneath Passwords there should be an option ’ Use a master password ’ tick the checkbox next to it

    Use a master password

  • A screen will pop-up where you need to enter you’re **password

    **Change Master Password

  • Enter you’re password and click on OK

  • Now everytime Firefox is started you will need to enter you’re password in order to use Firefox