!Friendica Admins I just read, that Nitter is discontinued, due to some changes at Twitter. I guess you should disable that addon on your system in the not so far future.
Privacy-oriented X front-end Nitter is shutting down following changes to guest accounts https://alternativeto.net/news/2024/1/privacy-oriented-x-front-end-nitter-is-shutting-down-following-changes-to-guest-accounts/