For those of you who use Chrome as their browser...
 

It's the best browser I think, but anyway, here is a reddit thread on some of the best extensions for Chrome that are super easy to add and if you are logged into Chrome on multiple PCs, they will appear on all the browsers.

I already had a number of these (such as uBlock origin, which I highly recommend) but added Magic Actions for YouTube and that is a really nice extension, and you can even use your mouse scroll wheel for the volume control (super handy.)

Thanks I'll look at it. :-)