One thing to do also to be sure that the blocked ad does not come back: clear all cookies related to IMCDb (you'll then have to log in again, obviously).

In Firefox you can do it via F12 -> Storage, then you see all the cookies for the current domail, you can remove all
In Edge (so I assume Chrome too), via F12 -> Application

There is maybe another way to do so (via a more user-friendly screen)