[want2know]

I believe the article is false.

As far as I understand [1] Firefox will notice you if the domain was breached and your password is older than the breach.

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1559365

[lucideer]

From that ticket, the comments discussing the domain and time of the breach are about adding that filtering to the existing feature, not about those being the only checks. The article is not false.

[groovecoder]

Answered here: https://news.ycombinator.com/item?id=20465981