How to change how your YouTube web interface looks

a)What you will basically need:

Install V3 - The Fantastic Nostalgic YouTube Client

 

Install the StarTube script in ViolentMonkey

b)After installation, when you enter YouTube, you will see something like the photos from above. Before you start panicking that you accidentally ended up in 2014 let me show you how to change the interface to your desired period.

c)Click on the ViolentMonkey icon, you will see a small menu called StarTube, click on the option "Open StarTube settings".

d)After that you will see a big window with different periods of time and builds that YouTube had, just select your desired option and the refresh button from above the window.

e)If you don't like what you selected, just repeat the process starting with step c). Cheers!