5 ms·I'm on Firefox 56. Is there a way to see if my extensions (and FT DeepDark theme) works on 57?by bvi 9y agoI'm on Firefox 56. Is there a way to see if my extensions (and FT DeepDark theme) works on 57?sgift 9y agoIf you go to the add-on page of your extension there's a "Works with FF57+" if it works.NuDinNou 9y agoIt does not. But FF57 comes with a compact and dark theme, you can select it in the Customize window.