This is what the situation looks like with existing notifications now (1-3).
Scan.png
4 -- as it should be, it's reasonable. And not to receive warnings after everything has already been read and answered.
This is your browser, your forum.
It is not difficult to create a simple check for each tile, when creating/editing it for the presence of https://forum.vivaldi.net
A post in the mobile section, pictures from the desktop -- but the principle is the same.