How to fix 'Unchecked runtime.lastError: Could not establish connection. Receiving end does not exist.'

Question

I have the following error in the Chrome Dev Tools console on every page-load of my Node/Express/React application:

Unchecked runtime.lastError: Could not es

Answer 1

I was testing my extension on edge://extensions/ page/tab. Testing it on another tab solved this issue. I think this may also occur for chrome://extensions/.