addbutton.js

/*
Author: Abhijeet Rastogi (shadyabhi)
Email: abhijeet.1989@gmail.com
*/

LoadAllComments = {
    runAgain : function () {
    //Run every two seconds (API guidelines)
        window.setTimeout(LoadAllComments.clickFirstButton, 2000);
    },
    clickFirstButton : function () {
        //All buttons have class as "button"
        var first_button = document.getElementsByClassName("button")[0];
        if (first_button == null) {
            return;
        }

        if (first_button.innerHTML === "loading...") {
            first_button.className = ""; //To fix later
        } else {
            var theEvent = document.createEvent("MouseEvent");
            theEvent.initMouseEvent("click", true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
            first_button.dispatchEvent(theEvent);
        }

        if (first_button.id) {
            LoadAllComments.runAgain();
        }
    },

    createButton : function () {
        //Link created and added as child to "pane"
        var pane = document.getElementsByClassName("panestack-title")[0];
        var newlink = document.createElement("a");
        newlink.appendChild(document.createTextNode("Load all comments"));
        newlink.id = "loadmorecomments";
        newlink.href = "javascript:void(0)";
        newlink.className = "title-button ";
        newlink.title = 'Opens all "load more comments" links every 2 seconds';
        newlink.addEventListener('click', LoadAllComments.runAgain, false);
        pane.appendChild(newlink);
    }
};

LoadAllComments.createButton();