@bassett Hi, It is working on the normal Opera,
open this link in opera browser:
https://chrome.google.com/webstore/detail/kaspersky-password-manage/dhnkblpjbkfklfloegejegedcafpliaa
and it will ask you to use or enable Chrome extensions on opera, agree on that, then install it, it will work with you.
Inform me please if it did or not.
best wishes