I just found this extension and I thought it would worth it sharing it with you. Remember I didn't make this
You can select a username or an email and checks it against major database leaks to identify whether the account is included in them.
It's a great tool for cracking since it can be used only any email on the run while browsing.
If there is a match in any of the databases you can download the database from the web or in dark net and find the password/hash.