Hides Gmail ads as they appear

gmail-hide-ads.js

(function() {
    'use strict';
 
    var style = document.createElement('style');
    style.type = 'text/css';
    style.innerHTML = '.hidden { display: none; }';
    document.getElementsByTagName('head')[0].appendChild(style);
 
    function blockAds() {
 
        var spans = document.querySelectorAll('tr > td > div > span > span');
        var searchText = "Ad";
 
        for (var i = 0; i < spans.length; i++) {
            if (spans[i].textContent == searchText) {
                spans[i].parentElement.parentElement.parentElement.parentElement.style = 'display: none';
                spans[i].parentElement.parentElement.parentElement.parentElement.classList.toggle('hidden');
            }
        }
    }
 
    function setup() {
 
        blockAds();
 
        setInterval(function() {
            blockAds();
        }, 1000);
 
        // Listen for tab changes
        document.querySelectorAll('[role="tab"]').forEach(function (el){
            el.addEventListener("click", function() {
                blockAds();
                var counter = 0;
                var look = setInterval(function() {
                    if (counter > 250) {
                        clearInterval(look);
                    }
                    blockAds();
                    counter++;
                }, 5);
            });
        });
    }
 
    var watcher = setInterval(function() {
        if (document.querySelectorAll('[role="tab"]').length > 0) {
            setup();
            clearInterval(watcher);
        }
    }, 5);
 
})();

https://greasyfork.org/en/scripts/416410-gmail-ad-blocker