When comparing Firefox Lockwise vs LessPass, the Slant community recommends LessPass for most people. In the question“What are the easiest to use password managers?” LessPass is ranked 10th while Firefox Lockwise is ranked 11th.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Cloud backup and sync
Pro Included in Mozilla Firefox by default
Pro Cross-platform
Pro Passwords are now encrypted (256 bits)
Unlike in the old versions of Firefox, now the passwords are protected with a strong, military grade encryption (256 bits)
Pro Free and Open Source Software (Mozilla Public License 2.0)
Pro Features a built-in random password generator
It can suggest you strong passwords when your registering for a website.
Pro Autofill support
Firefox Lockwise can autofill your passwords.
Pro Open source
Pro Really platform-free
Works everywhere, in any device that can run javascript.
Pro Doesn't store passwords
If it's not stored, it can't be stolen.
Cons
Con Deterministic
Deterministic password managers have many drawbacks.
Con Cannot store existing secrets
Existing secrets (aka passwords) cannot be stored with deterministic password managers. In order to use LessPass effectively, you will need to change your password on every site.
Con Easily cracked with exposed/compromised master password
Since anyone can use LessPass with the same parameters as you, all they need is your master password (which could be obtained through keylogging or numerous other methods) to gain access to every one of your site passwords.