Use the "passwords" feature to check if one of yours is compromised. If it shows up, never ever reuse those credentials. They'll be baked into thousands of botnets etc. and be forevermore part of automated break-in attempts until one randomly succeeds.
Protip for the room: Use a password manager with a unique password for every service. Then when one leaks, it only affects that singular service, not large swaths of your digital life.
Which one works on all browsers including mobile safari and mobile Firefox?
If there's one thing I've always been wary of, it's the password manager browser extensions. And I've been proven right. Don't be lazy, it takes 30 extra seconds to do it manually.
Pishing detection is nice though, I'll admit.
There are two major threats to a password manager:
The second is much harder to mitigate, but also much harder for an attacker to pull off since they need to compromise the update delivery chain.
Whatever client you use, make sure you trust the update mechanism.