Configure Google Chrome to stop opening 5353 port for listening

Today I have noticed that Google Chrome opens a UDP listening port 5353 whenever I open the browser.
After searching about it, I found this solution shuts down the port,

Create a file under /etc/opt/chrome/policies/managed directory

e.g.:  blockport.json

Add this line to the file,
{ "EnableMediaRouter": false }

Finally it will look like this,
[root@localhost ~]# cat /etc/opt/chrome/policies/managed/blockport.json
{ "EnableMediaRouter": false }


Restart the browser. It will not open the port anymore.

Source: https://unix.stackexchange.com/questions/187294/chromium-browser-pepperflashplugin-opening-listening-ports-on-0-0-0-05353


Update,
For latest Google Chrome instances, Above method didn't work and I have found out that disabling "Show notifications when new printers are detected on the network" shutdown port 5353. Please note that I'm using Version 81.0.4044.129 (Official Build) (64-bit) on MacOS

Avoid WebRTC leak if you use browser + VPN or SSH Tunnel

I have been using a SSH tunnel (Please see this post for the instructions, http://swapoff.blogspot.com/2018/03/how-to-create-ssh-tunnel-and-use-it-for.html) for web browsing via Firefox.

I used it to forward DNS queries well. So I thought I'm pretty much safe until I read about WebRTC feature in web browsers.

WebRTC allows P2P communication for real time communication in web browsers.  WebRTC can be used to get your true IP address via STUN requests with browsers, even when you are using a VPN or SSH tunnel.

You can check whether WebRTC is enabled using several methods, but checking it via a web application is easier than any other methods. e.g.: https://browserleaks.com/webrtc

To disable WebRTC in firefox, set media.peerconnection.enabled to false via about:config