Tampermonkey script to remove annoying gmail prefixes

ExternalSenderCleaner.js

// ==UserScript==
// @name         Remove [External Sender] v0.2
// @namespace    https://mail.google.com
// @version      0.2
// @description  try to take over the world!
// @author       Lee Joramo
// @match        https://www.tampermonkey.net/index.php?version=4.10.6111&ext=iikm&updated=true
// @match        https://mail.google.com/mail/*

// ==/UserScript==

(function() {
    'use strict';
    replaceTextPatterns();
    setInterval(function() {
        replaceTextPatterns();
    }, 1000);
})();




function replaceTextPatterns() {
    var replaceArry = [
        [/\[EXTERNAL SENDER\]/gi, '⚠️']
        // etc.
    ];
    var numTerms    = replaceArry.length;
    var txtWalker   = document.createTreeWalker (
        document.body,
        NodeFilter.SHOW_TEXT,
        {   acceptNode: function (node) {
                //-- Skip whitespace-only nodes
                if (node.nodeValue.trim() )
                    return NodeFilter.FILTER_ACCEPT;

                return NodeFilter.FILTER_SKIP;
            }
        },
        false
    );
    var txtNode     = null;

    while (txtNode  = txtWalker.nextNode () ) {
        var oldTxt  = txtNode.nodeValue;

        for (var J  = 0;  J < numTerms;  J++) {
            oldTxt  = oldTxt.replace (replaceArry[J][0], replaceArry[J][1]);
        }
        txtNode.nodeValue = oldTxt;
    }
}