Remove Reddit Promotional Tweets (To use with Javascript extension such as Custom Javascript For Websites 2)

RemoveRedditPromos.js

function findTopPostElement(el){
    if(isTopPostElement(el)){
        return el;
    }
    else{
        return findTopPostElement(el.parentElement);
    }
}

function isTopPostElement(el){
    if(el.classList.length === 0 && el.parentElement.classList.length > 0){
        return true;
    }
}

function removePromotedElements() {    
    let promotedElements = getPromotedElements();
    promotedElements.forEach(function (el) {
        let topPostElement = findTopPostElement(el);
        topPostElement.style.display = 'none';
    })
}

document.onscroll = function(){
    removePromotedElements()
}

function getPromotedElements() {
    return [].slice.call(document.getElementsByTagName('span')).filter(function (el) {
        if(el.innerText){
            return el.innerText.toLowerCase() === 'promoted'
        }
    })
}
removePromotedElements()