Addon is great.

Only two things I would like.
1. Open to enable/disable the "JS Disabled" banner.
2. In new tabs the button showed the global javascript block state. It shows it on until a site starts to load.

Works very well. Would be that much better if messages and banner could be configured off.

I gave it four stars, because it's working. But it's NOT doing exactly what the developer says it should do.
It disables/enables JavaScript on internet, but not on local files. If you disable JavaScript in about:config, it's also disabled for local files.
It would be really great if you could make it working for local too, but I guess Mozilla makes that impossible.
Even in their own developer tools you can disable JavaScript only until you reload the page.
It would be really great if you could make a simple way to disable/enable JS for local files too.

Works great! The only thing that would make it better is if it had the option to reset to disabled when you opened a new tab, but not a big deal to manually reset it.