Helped me.

Most convenient userscript manager for Firefox

Well-designed addon, but I find that it's a shame for it to have gone closed-source 10 years ago. No thanks, I'll switch to ViolentMonkey, which I can read the code of and modify as I please.

Good app

Nice add-on, awful privacy policy.

The best script manager.

Неплохое приложение. Но при наличие правильного скрипта может блокировать даже рекламы яндекса