This addon will disable the unfollow button for channels you already follow on twitch , so you won't misclick and unfollow someone , if you would like to unfollow someone , you could uncheck the addon from the addons list , unfollow the channel , and then recheck the addon from the addon list.
To install the addon click the "Add to Firefox" , after that you can head to my channel twitch.tv/scop3scout
or any other twitch channel and press the follow button , after you'll press it the button will disappear and you don't have to be worry about it again :) (You might need to restart Firefox in order for the addon to work)
The addon works on every device using FireFox and using a simple code which remove only the unfollow button and still display the follow button for channels you still didn't follow.
For more info check out my twitter twitter.com/sCop3SCouT