Invidious Video Previews

Replace thumbnail with video previews passing the cursor above each.
Wrap lines
// ==UserScript==
// @name         Invidious Video Previews
// @version      0.3
// @author       Amir Torrez
// @description  Replace thumbnail with video previews passing the cursor above each.
// @icon         data:image/png;base64,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
// @namespace    https://gf.qytechs.cn/users/433508
// @include      *invidio.us/*
// @include      *yewtu.be/*
// @include      *invidious.snopyta.org/*
// @include      *invidiou.sh/*
// @include      *tube.poal.co/*
// @include      *yt.elukerio.org/*
// @include      *invidious.drycat.fr/*
// @include      *invidious.ggc-project.de/*
// @include      *invidious.kabi.tk/*
// @include      *yt.openalgeria.org/*
// @include      *invidious.nixnet.xyz/*
// @include      *vid.wxzm.sx/*
// @include      *yt.lelux.fi/*
// @include      *invidious.13ad.de/*
// @include      *watch.nettohikari.com/*
// @include      *invidious.fdn.fr/*
// @grant        none
// @inject-into  auto
// ==/UserScript==

var t = document.querySelectorAll("div.thumbnail");
var frames = ["hqdefault.jpg", "hq1.jpg","hq2.jpg","hq3.jpg"];
var pos = 1;

t.forEach(
  function(cbox) {
   cbox.addEventListener("mouseover", thumbnailIn, false);
  }
);

t.forEach(
  function(cbox) {
   cbox.addEventListener("mouseout", thumbnailOut, false);
  }
);

function thumbnailIn() {
  var nod = this.childNodes[1];
  var url = this.parentNode.attributes.href.value;
  var vid = url.replace("/watch?v=", "").substr(0, 11);
  if(url.indexOf("watch?v=") > 0) {
    window.interval = setInterval(function(){
      if (++pos >= frames.length) {
        pos = 0;
      }
      nod.setAttribute('src', "/vi/" + vid + "/" + frames[pos]);
    }, 500);
  }
}

function thumbnailOut() {
  var url = this.parentNode.attributes.href.value;
  var vid = url.replace("/watch?v=", "").substr(0, 11);
  if(url.indexOf("watch?v=") > 0) {
     this.childNodes[1].setAttribute('src', "/vi/" + vid + "/" + frames[0]);
     clearInterval(window.interval);
  }
}
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