Thank you for your swift reply
Yes, you are right, it is not possible to clean the web site server from my side but how about the ESET to disconnect and/or delete the infected downloaded pictures, connections, ads, banners, etc. while browsing via Firefox automatically, without blocking the whole page? Think like an adblocker as uBlock Origin or Adblock Plus, they block only the unwanted content but not the whole website.
I can do this manually while the settings are configured as "Always ask the end-user"; ESET loads the page, detects the threats and asks user