Pin your favorite Twitch channels to the top of the navigation bar so you can easily see when they're live.
This bypasses the default order sorted by viewcount so your favorite smaller channels can appear near the top.
Go to the add-on's options page and enter in the channel names, then refresh Twitch.
ctlr-shift-a -> Twitch Pin Favorites -> Options
Go to about:debugging#/runtime/this-firefox and load as temporary add-on.
DOMPurify is used to sanitize HTML inputs.