В вашем коде обнаружены мною были ошибки, в Опере он не работал.
Исправленный код ниже. Удачи!

// ==UserScript==
// @name        Nichosi
// @namespace   https://openuserjs.org/scripts/maks4339/Nichosi
// @include     http*://vk.com*
// @include     http*://vk.com/*
// @version     2.5
// @description Ничоси вылазит, когда жмакаешь на лайки ВКонтакте.
// @icon        http://klimova.tk/nichosi/nichosi.png
// @grant       none
// @copyright   2015, Maks
// ==/UserScript==


tempImg= new Image();
tempImgStr= new Image();
tempImg.src= 'http://klimova.tk/nichosi/nichosi'+(window.devicePixelRatio >= 2 ? '_2x' : '')+'.png';
tempImgStr.src= 'http://klimova.tk/nichosi/nichosi_str'+(window.devicePixelRatio >= 2 ? '_2x' : '')+'.png';
tempImg.onload = function(){
  tempImgStr.onload = function(){
var newWidth=tempImg.naturalWidth;
var newHeight=tempImg.naturalHeight;
var newWidthStr=tempImgStr.naturalWidth;
var newHeightStr=tempImgStr.naturalHeight;

var Doge = {

show: function() {
  if (Doge.shown) {
    return false;
  }
  Doge.shown = true;
  var dogeDom = ge('vk_doge');
  if (!dogeDom) {
    var src = tempImg.src;
    var srcStr = tempImgStr.src;
    dogeDom = ce('a', {
      id: 'vk_doge',
      innerHTML: '<div style="font-family: \'Comic Sans MS\', cursive; font-size: 24px; position: absolute; margin-top: -56px; width: 150px; text-align: center; opacity: 0;filter: alpha(opacity=0);">WOW</div><img id="nichosi_str" style="position: absolute;" src="'+srcStr+'" width="'+newWidthStr+'" height='+(newHeightStr+2)+'"><img src="'+src+'" width="'+newWidth+'" height='+newHeight+'">',
    }, {
      position: 'fixed',
      bottom: -150,
      right: 50,
      width: newWidth,
      height: newHeight,
      padding: '35px 35px 0px 35px',
      zIndex: 110
    });
    utilsNode.appendChild(dogeDom);
  }
  debugLog(dogeDom);
  show(dogeDom);
  animate(dogeDom, {bottom: 0}, {duration: 150});
  var nStr = ge('nichosi_str');
  setStyle(nStr, {marginTop: 0});
  setTimeout(function() {
    animate(nStr, {marginTop: -20}, {duration: 300, transition:function(t, b, c, d) { return c * cubicBezier(0.47, 4.29, 0.51, 0.3, t/d, 4/d) + b; }});
  }, 150);
  setTimeout(Doge.hide, 1000);
},

hide: function() {
  var dogeDom = ge('vk_doge');
  var nStr = ge('nichosi_str');
  animate(nStr, {marginTop: -180}, {duration: 200});
  animate(dogeDom, {bottom: -150}, 200, function() {
    animate(nStr, {marginTop: 0}, {duration: 150, transition: Fx.Transitions.swiftOut, onComplete: function() {
      hide(dogeDom);
      Doge.shown = false;
    }});
  });
},

updateLikes: function() {
  var likes = geByClass('post_like_link');
  for(var i in likes) {
    likes[i].innerHTML = 'Such Like';
  }
  var onlines = geByClass('online');
  for( i in onlines) {
    if (onlines[i].tagName == 'SPAN') {
      onlines[i].innerHTML = 'So Online';
    }
  }
},

initSound: function(url) {
  if (!window.Sound) {
    cur.sound = {play: function () {}, stop: function() {}};
  } else {
    cur.sound = new Sound(url, {forceMp3: true, forcePath: url});
  }
},

blowTimer: function(el) {
  if (cur.blowing) {
    return false;
  }
  if (cur.blowed) {
    return nav.go(el);
  }
  Doge.initSound('mp3/boom.mp3');
  cur.blowing = true;
  var st = 'style="font-size: 2em; text-align: center; font-weight: bold;"';
  showDoneBox('<div ' + st + '>3</div>', {w: 20, out: 3000});
  var start = new Date().getTime(); el = geByClass1('top_result_baloon');
  var interval = setInterval(function() {
    var now = 3000 - (new Date().getTime() - start);
    if (now <= 0) {
      clearInterval(interval);
      Doge.blowImages();
    } else {
      el.innerHTML = '<div ' + st + '>' + Math.ceil(now / 1000) + '</div>';
    }
  }, 100);
},

blowImages: function() { 
  var imgs = geByTag('img', bodyNode);
  cur.sound.play();
  each(imgs, function(i, img) {
    if (img.parentNode === bodyNode || !isVisible(img)) return;
    var sz = getSize(img), pos = getXY(img),
        centerPos = [lastWindowWidth / 2, scrollGetY() + lastWindowHeight / 2], centerSz = [0, 0], bg, step = 1500;
    if (!sz[0] || !sz[1]) return;
    bg = ce('div', {}, {width: sz[0], height: sz[1], backgroundColor: '#f1f1f1', display: 'inline-block', border: '0px', margin: '0px', padding: '0px'});
    img.parentNode.insertBefore(bg, img);
    bodyNode.insertBefore(img, domFC(bodyNode));
    setStyle(img, {position: 'absolute', left: pos[0], top: pos[1], width: sz[0], height: sz[1], zIndex: 100});
    var dx = pos[0] - centerPos[0] + (sz[0] - centerSz[0]) / 2,
        dy = pos[1] - centerPos[1] + (sz[1] - centerSz[1]) / 2;
    animate(img, {left: pos[0] + step * dx / Math.abs(dx), top: step * dy / Math.abs(dx)}, {duration: 1000, transition: Fx.Transitions.linear, onComplete: function() {
      re(img);
      cur.blowing = false;
      cur.blowed = true;
    }});
  });
},

eof:1};try{stManager.done('doge.js');}catch(e){}
///////////////////////////////

window.Doge=Doge;
if(stManager){
stManager.add('page.js',function(){

var oldlike=wall.like;
wall.like=function(){
    Doge.show();
    return oldlike.apply(this,arguments);
};

});
}
  };};
/////////////////////////////////////////////////////////////
function Nrefresh(){
var f1 = document.getElementsByClassName('post_like_link fl_l');
for (var i=0; i<f1.length; i++){
         f1[i].innerHTML='Любо';
}
f1 = document.getElementsByClassName('like_link fl_l');
for (i=0; i<f1.length; i++){
         f1[i].innerHTML='Любо';
}
f1=document.getElementById('pv_like_link');
if(f1){
  f1.innerHTML='Любо';
}
setTimeout(Nrefresh, 300);
}
Nrefresh();