I really like the idea of this, but unfortunately it is very user unfriendly. The Pass monitor suggests that I change insecure passwords on websites, but the extension itself prevents me from doing it. It will save log-ins that I had already created myself, but there is no way to change and improve them. In fact, with the 3 fields to fill out (old password, new password and verify new password), the extension makes it impossible. It has been a frustrating experience trying to make ProtonPass do what it should do. Repeatedly trying to get help on Proton's subreddit did not bear fruit.
I have been a paying Proton customer for years, but ProtonPass is a time-consuming disappointment.

Update: Specifically paypal.com and ebay have been impossible. I have tried a number of times over the past months without success. Another issue is that paypal has very specific limitations as to what is accepted in terms of a password (which characters, symbols, password length, etc). Per my experience, and after a lot of time attempting, this cannot be created by ProtonPass.

Update: Passmail does not get accepted on all platforms/sites when opening new accounts.