github_img_load_later.js

Array.from(document.querySelectorAll("img[src^=\"https://private-user-images.githubusercontent.com/\"]")).forEach((img, index, array)=>{
    if(!img.complete) {
        let imgSrc = img.src;
        img.src = "";
        img.style.display = "none";
        // img.setAttribute("_src", imgSrc)
        let anchor = img.parentElement;
        // anchor.removeChild(img);
        let textNode = document.createTextNode("click to view image");
        anchor.appendChild(textNode)
        anchor.setAttribute("href", "#")
        
        anchor.onclick = (event)=>{
            anchor.removeChild(textNode)
            img.src = imgSrc;
            img.style.display = "";
            anchor.onclick = null;
            anchor.removeAttribute("href")
            return false;
        };
    }
})

github_img_load_later.min.js

javascript:Array.from(document.querySelectorAll('img[src^="https://private-user-images.githubusercontent.com/"]')).forEach((img,index,array)=>{if(!img.complete){let imgSrc=img.src;img.src="",img.style.display="none";let anchor=img.parentElement,textNode=document.createTextNode("click to view image");anchor.appendChild(textNode),anchor.setAttribute("href","#"),anchor.onclick=event=>(anchor.removeChild(textNode),img.src=imgSrc,img.style.display="",anchor.onclick=null,anchor.removeAttribute("href"),!1)}});