Always reset the office favicon (never show the red dot)

office-favicon-freezer.user.js

// ==UserScript==
// @name        Microsoft office stable icon
// @namespace   Beeardhatcode
// @match       https://outlook.office.com/mail/*
// @grant       none
// @version     1.0
// @run-at      document-idle
// @author      -
// @description Always reset the office favicon (never show the red dot)
// ==/UserScript==

(function(){
    // https://commons.wikimedia.org/wiki/File:Microsoft_Office_Outlook_(2018%E2%80%93present).svg
    // Converted to base64 with https://heyallan.github.io/svg-to-data-uri/
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    const ml = (new MutationObserver(mutationList=>{
        mutationList.forEach((mutation) => {
            if(mutation.target.href != expectedFavicon){
                mutation.target.href = expectedFavicon;
            }
        });

    }));
    document.querySelectorAll("link[rel~='icon']").forEach(favicon=> ml.observe(favicon,{attributes:true}));
})()