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от Пользователь Firefox 5c7776 Ноя. 19, 2017 ·

doesn't work on new firefox ;/

от Oleksandr (Разработчик) на Ноя. 19, 2017 ·

Unfortunately, WebExtensions (the new API for Firefox 57+) does not have the functionality for the correct operation of this addon in Firefox 57+.

But you can install Firefox 52 ESR and enjoy work until June 2018
https://www.mozilla.org/en-US/firefox/organizations/faq/