@momosetkn キタ――(゚∀゚)――!!
(function{...})();
で囲って即時関数にしないとリロードが発生するらしい。。。
javascript:(function(){document.getElementsByClassName('drawer__inner__mastodon')[0].innerHTML = "<iframe src='https://discordapp.com/widget?id=414004586383409153&theme=dark' width='250' height='300' allowtransparency='true' frameborder='0'></iframe>";})();
試してみて
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