Incoming browser connection?

Question

Browsers

Really entering connection to a fox?
I just went to forchan and suddenly saw the following:

I checked the new rules for incoming connections, a couple really appeared:

What to do, what could it be?
Allow or block?
Who faced similar?

Answer 1

The Adobe Flash plugin is a real security hole, most likely it is.

Answer 2

It's definitely not an incoming connection. This is the firewall that prevents an unfamiliar program from accessing the outside.