nocomment niconico using tampermonkey.

nocomment niconico.js

// ==UserScript==
// @name         nocomment niconico.
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       takumi
// @match        http://www.nicovideo.jp/watch/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    // Your code here...
    var buttonClick = function(btn) {
        if(btn){
            if(btn.onclick){
                btn.onclick();
                //alert('onclick()');
            } else if(btn.click){
                btn.click();
                //alert('click()');
            } else {
                //alert('n/a');
            }
        } else {
            //alert('n/a');
        }
    };
    var proc = function() {
        var iconHide = document.querySelectorAll('.PlayerContainer > .TogglePattern > .ControllerBoxContainer > .ControllerContainer > .ControllerContainer-inner > .ControllerContainer-area > .CommentOnOffButton > .CommentOnOffButton-iconHide');
        //alert(iconHide + ", length:" + iconHide.length);
        if(iconHide) {
            for(var i = 0; i < iconHide.length; i++) {
                var svg = iconHide[i];
                var button = svg.parentElement;
                buttonClick(button);
            }
        }
    };
    proc();
})();