Import usernames and passwords from a file to Firefox

Enable this feature first:

go to the Firefox Configuration Editor (about:config page), find the preference and toggle it to true.

  1. Click on the menu button Fx89menuButton to open the menu panel.
  2. Click Passwords. The Firefox Lockwise about:logins page will open in a new tab.
  3. Click the Firefox Lockwise menu (three dots), then click Import from a File…