If you’re using a shared device and don’t want Firefox to remember your passwords, you change your preferences in the settings.

Disable all password saving

1. In the Menu bar at the top of the screen, click Firefox and select Settings (or Preferences, in some cases).Click the menu button and select Settings.
2. Click Privacy & SecurityPasswords and autofill in the panel to the left.
3. Scroll down to the Passwords section andIn the Passwords section, uncheck the box next to Ask to save passwords.

   

Disable password saving for specific websites only

You can also configure Firefox not to save passwords for specific websites. To add these exceptions:

1. In the Menu bar at the top of the screen, click Firefox and select Settings (or Preferences, in some cases).Click the menu button and select Settings.
2. Click Privacy & SecurityPasswords and autofill in the panel to the left.
3. Scroll down to the Passwords section andIn the Passwords section, check the box next to Ask to save passwords.
4. Click Exceptions… next toManage password exceptions underneath Ask to save passwords to open the exceptions panel.

   

5. Type the address of each website you don't want Firefox to save passwords, then click Block.
   Both http and https URLs for the website will be added to the exception list.
6. You can use Remove Website to remove the selected URL from the list, or Remove All Websites to remove all exceptions.
7. Click