If you have ever been found to receive a pop-up in a desktop browser telling you that “your password might be stolen,” then you should immediately change your password.
the example above is from the Firefox browser, he wrote
Passwords were leaked or stolen from this website since you last updated your login details. Change your password to protect your account. Learn more about this breach.
if from google chrome likes pop-ups.
If traced click Learn, then the result is like this Firefox password breach
You better to change those password.