Instructor: Navigate to Chrome extensions. Make sure to enable developer mode. In a directory, create a file called manifest.json. We'll define our JSON with a name. We'll call this backtowork. A version number is also required, so I'll make this 1.0A manifest version is also required, and they are in version 2 there. You can go ahead and load this in. Load unpacked and select the directory. Select, and we have our extension which does absolutely nothing. To make it do something, let's create some content scripts.
You define that in matches, which is another array. These are strings of URLs. I'm going to say twitter.com and any path, as well as reddit, and any subdomains, reddit.com, and any path. Let's save here and reload my extension.
If I navigate to Twitter, it tries to load, but then fires to backtowork. If I try and go to reddit, you'll see it loads and says "back to work."