Does a file appear when you open Toaster?

Question

Browsers

Mozilla Firefox, Linux Mint
Opening the toaster recently shows a file loading.
The file is empty, I tried to open it) It doesn't drop out every time.
Is this normal or not?

Answer 1

At first glance, it looks like malware, either at the browser extension level or somewhere deeper in the system.
Perhaps I got it when installing some software that had hidden daws with the Criteo partner in the installer.
There is also an opinion that Criteo is a legitimate targeting banner system. You can try deleting all cookies related to criteo or blacklisting it in your banner cutter.
It is possible that afr.php is reported as a file by mistake on the side of the Criteo web servers, and more often it loads normally in the banner area.
Yes, this seems to be a bug of the Criteo ad network servers and the wrong mime-type from their web server.
There is no way to fix it, except to kill it through AdBlock / uBlock / Ghostery. Most likely Criteo is already on their lists.
If you don't use AdBlock derivatives, you can just add cas.fr.eu.criteo.com as 127.0.0.1 to hosts.