Greasy Fork is available in English.
The fastest Duolingo XP farmer, working as of July 2024.
The script does not work using Violentmonkey, either.
If you are using preview.duolingo.com, some changes Duolingo has made might break Duolingo Pro. Please updating to 9.6.6 which should have some fixes
The "Solve" and "Solve All" buttons do not appear during lessons. I am using Tampermonkey.