Same as cookie.chrome, but works for Firefox.
If enabled, the login will try to reuse existing Firefox cookies. You can verify it by printing debug output as below.
$ leetcode user -l -v
login: <you account>
pass:
[DEBUG] running cookie.firefox.login
[DEBUG] running cookie.firefox.signin
[DEBUG] try to copy leetcode cookies from firefox ...
[DEBUG] Successfully copied leetcode cookies!
[DEBUG] running leetcode.getFavorites
Successfully login as <your account>