Tutorial:

1. Install and open.

- After installing the extension. Click on the extension icon

On the Twitch site, go to the channel of the streamer you want to follow and get notified
There are 2 ways to get streamer notifications.
1. Click the heart icon
2. Enter the name of the streamer, and press +

When you receive a message like the screenshot, you are successful

You can also sync your Twitch account, the extension will import all the streamers you followed with your twitch account before.
You can choose either Add or Replace , here I choose Add

As you can see, I synced 2 more streamers that I followed at my account