I was so happy this theme was working on v. 56, and now I've updated and got depressed. I've used this theme since forever, it doesn't even feel like I'm on firefox without it. Chatzilla also no longer works. I don't really understand anything about anything when it comes to software, maybe the changes are actually great, but it just sort of gets to a point where you become freaking annoyed when everytime you update half your extensions stop working, and now apparently some of them are gone for good. It was a good run tho, NNL was the best theme ever.
Edit: Ok apparently from now on extensions will be more secure and wont stop working everytime firefox updates, which is a good thing I guess. Still, I've lost a few of my favorite and most used extensions in the process, and never had any security problems in the many years I've been using firefox to begin with, which means I remain disappointed at this update.
This theme was awesome tho, my props to the developer and the people who may have helped maintain it over the years.