Das Add on funktioniert ohne Probleme und ist sehr hilfreich.

Somehow the only extension that performs its function.

Tried installing today and that was fine. When I attempted to share something to my email, it sent the URL via a link to the developer's website, where it just hung. I finally gave up. It looks like this app is abandoned, and depends on the developer's website working to function properly, so maybe the extension is just broken now?

Can't get share button

No updates for over a year, nothing posted on their Twitter page for over a year... hum!

２クリックでLINE、Twitter、メール、Mastodonなどあらゆるサービスに共有することができて使いやすいです。特に共有ボタンが設置されていないウェブサイトをシェアする際に役立っています。

Addon is good. Better share url for Telegram is directly to desktop App.
URL is:
tg://msg_url?url=https://www.firefox.com

It works, but I can't use it as the one thing I don't like about it is it replaces slashes with %2F and corrupts the address for any social site to use. Please remove this aspect and simply use addresses as-is so we don't have to manually fix them every time. I'll use this addon if you do so.

(UPDATE: Apparently this is a site by site issue. I just found out that sites like comicsands do this while others don't. Not sure why.)