Is anyone else getting this pop up?

[WholeAgain]

I've had this about 5 times today after opening different threads. Mumsnet was the only tab open.

On android mobile. Chrome.

Avast virus scan is clear.

Now I've had this ... thankfully blocked but why is it happening? Again only mumsnet open, just browsing a thread.

It doesn't happen on any other sites on my phone.

I run an adblocker - thankfully don't see anything.

Google adblocker and install one.