removeN.js

// Paste into the console (F12) 

(()=> {
    let removeN = (element)=>{
        if(!element.textContent) return;
        element.textContent = element.textContent.split('n').join('');
        element.textContent = element.textContent.split('N').join('');
    }
    let elements = [...document.body.children];
    while(elements.length>0) {
        let el = elements.pop();
        elements.push(...el.childNodes);
        if(el.nodeName=="#text") removeN(el)
    }
})()