Installing the required redux-devtools-extension is easy, but be careful! Don't confuse the redux-devtools-extension package, at https://github.com/zalmoxisus/redux-devtools-extension, with redux-devtools, a similar but different package at https://github.com/reduxjs/redux-devtools. The latter is more of a "DIY" package, which requires plenty of configuration, though it will let you create a totally custom monitor for Redux, if you care to. For ourselves, this is what we need:

npm install redux-devtools-extension --save-dev

You will also want to install a Chrome extension, Redux Devtools, which works together with the package we just installed. This extension will add a new option to the web developer tools, as we'll see.