My app id is ok. I already integrated admob mediation in another project (with firebase) by myself and everything is ok. But not in a cross plateforme way, that's why i wanted to try out the sdkbox plugin. So i don't think it's a virus.
If i disable debuging, the web page won't show but ads still won't work (can't cache or show).
The strange thing is that this web page will only be shown once, on the first launch of the app only, after installation.
Maybe my project is broken on android. I'll try to integrate admob on a fresh project and will tell you if it works.
Thanks for your help.