It's my first time using grease monkey, and I'm a novice at javascript, but I have some simple code to delete the suggested videos on the right-hand side of YouTube, which I find can distract me from work:
var elem = document.getElementById('watch-related');
elem.parentNode.removeChild(elem);
I've tried using addEventListener(); as well as a while loop with a setTimeOut(); and I've tried setInterval(). None worked. But they all, including the plain code, work if I refresh the page or arrive at the link from an external source, but if I arrive at the video from another YouTube page it doesn't.
I think it has something to do with the way YouTube loads pages, but I haven't been able to find any workarounds. Any ideas?
Edit: I also found this, which has some good info on this topic, but also doesn't work.
Option 1:
Install uBlock Origin or Adblock Plus, and add a custom filter: youtube.com###watch-related.
Option 2 (in case you have to use Greasemonkey):
// ==UserScript==
// @name Youtube Suggested Video Hider
// @include https://www.youtube.com/watch?*
// @grant GM_addStyle
// ==/UserScript==
GM_addStyle('#watch-related { display: none; }')