The Firefox Add-On 'Live Stream Notifier' is currently not showing any live Twitch channels. Twitch changed it's API authentification method (see here), that's why many web extensions no longer have a simple way to access data from twitch. The maintainer of the Live Stream Notifier announced, that the extensive adaption to this API change will not happen in the near future. The extension will stay broken for some time.
We will (against Twitch's recommendations) aquire an application acces token and use it to access the API. This is not the correct flow for web extensions, but it is the simplest way to regain API access. Then we insert the token into the extension code,