YouTube / HookTube RegEx based URL conversion.

Reghook.js

// ==UserScript==
// @name        URL Conversion | YouTube - HookTube
// @namespace   Tazeki
// @description The smallest, possibly most useful YouTube-HookTube conversion script.  RegEx based.  Report bugs to tangentale@protonmail.com.  Sends any /www.youtube.com/ sites to HookTube before page load.  Does not affect /other.youtube.com/, (gaming.youtube.com, creatoracademy.youtube.com, etc.).
// @include     *youtube*
// @version     1
// @grant       none
// @run-at document-start
// ==/UserScript==

var url = window.location.toString();
if (url.indexOf('www.youtube.com') !== - 1) {
  window.location = url.replace(/youtube.com/, 'hooktube.com');
} else if (url.indexOf('www.youtu.be') !== - 1) {
    window.location = url.replace(/youtu.be/, 'hooktube.com');
}

Firefox users will need to look up how to find their profile directory and maybe read a how to on Grease Monkey .

Not at all, @Lew-Rockwell-Fan. Even someone like me, who only had one single script installed was able to do it just fine.

1. Copy the piece of code created by Tazeki
2. Go to GreaseMonkey and hit the "New User Script" button.
3. In the new tab that opens, paste the code and hit the floppy disk/save button
4. Test.

And that's it. It's extremely easy.