YouTube Thumbnail Grabber (Bookmarklet)

// Use a bookmarklet creator like https://caiorss.github.io/bookmarklet-maker to turn this into the final product
// After you placed the bookmarklet on your bookmarks bar, go to any YouTube video and click it to instantly open its thumbnail in a new tab

if( window.location.hostname == "www.youtube.com" ) {
if( window.location.pathname == "/watch" ) {
var url = window.location.href
var currentVideoID = null
currentVideoID = url.replace("https://www.youtube.com/watch?v=", "");
currentVideoID = currentVideoID.replace("http://www.youtube.com/watch?v=", "");
currentVideoID = currentVideoID.replace("www.youtube.com/watch?v=", "");
currentVideoID = currentVideoID.replace("youtube.com/watch?v=", "");
window.open("https://i.ytimg.com/vi_webp/" + currentVideoID + "/maxresdefault.webp")
} else {
alert("YouTube Thumbnail Grabber only works on YouTube videos!")
}
} else {
alert("YouTube Thumbnail Grabber only works on YouTube videos!")
}