ARS Technica reports you can now generate pseudorandom passwords (just like in Chrome) and that the tool will automatically inform you if one of your passwords appears in dumps of hacked credentials and passwords:
In addition to automatically generating pseudorandom passwords for you, saving them, and automatically filling out login forms with them, Lockwise continuously scans the Internet for password and database dumps that might contain leaked copies of your credentials. Lockwise does this by comparing a hash of each of your passwords to hashes of the passwords in the dumps and leaks—so you don't have to worry about Mozilla itself, or its employees, "knowing" your password.Additionally, Firefox 70 also fixes some issues that will result in better battery life for Mac users.