Use this instead: https://addons.mozilla.org/fr/firefox/addon/password-hasher/
Chrome equivalent: https://chrome.google.com/webstore/detail/password-hasher-plus-pass/glopbmohkffbnplcjbbbfmmimfhfnhgd
Compatible Android app: https://play.google.com/store/apps/details?id=com.ginkel.hashit