Shift comments of YouTube Premiers videos

comment_shifter.js

    (async function() {
        'use strict';
    
        let shift = 9;
        console.log("Comment Shifter! shift:" + shift);
        const sleep = msec => new Promise(resolve => setTimeout(resolve, msec));
        let button = null;
    
        for (let i = 0; i < 100 && !button; i++) {
            await sleep(100);
            button = document.querySelectorAll("paper-button")[4];
        }
    
        if (!button) {
            console.log("button NOT found.");
            return;
        }
    
        if (button) {
            console.log("button found");
            button.click();
        }
    
        let obj = null;
        for (let i = 0; i < 100 && !obj; i++) {
            await sleep(100);
            var chat_frame = document.querySelector("ytd-live-chat-frame");
            obj = chat_frame.querySelector("iframe").contentDocument.querySelector("yt-live-chat-renderer");
        }
    
        if (!obj) {
            console.log("Comment Shifter stopped.");
            return;
        }
    
        obj.__playerProgressChanged = obj.playerProgressChanged_;
        obj.__shift = shift;
        obj.playerProgressChanged_ = (time, b, c) => obj.__playerProgressChanged(time + obj.__shift, b, c);
    
        console.log("Successfully Shifted");
    })();