I thought it might solve captchas on all websites.

Joshi Koukousei Captcha Service

Wtf is this?

Why would anyone want to do this?

Do not redeem sir

Just use arkenfox user.js or librewolf. Firefox is a lost cause at this point. Mozilla doesn’t care about its users and keeps adding unnecessarily stuff. They blantantly lie about privacy when it takes hundreds of about:config preferences to make it remotely good in terms of privacy.