makes youtube video completely dark, same with other video pages, unable to select to only apply to specific pages

A great addon in theory but in practice it makes pages load 4-5x slower than normal firefox, or not load at all meaning you need to keep refreshing until the page works again. This extension would be a 5 if it didn't have any performance impact, however in its current state I would not recommend it.

This thing made my lapup sounds like AC outdoor unit when trying to adjust brightness

In many case better visuals than vanilla webpage, but it does not allow for whitelisting webpages

Es bueno, pero aveces ralentiza las paginas webs, en Skindex no me deja hacer nada

This works well on most sites, but for sites like Amazon, it blacks out the majority of product images so you end up not being able to tell what you are looking at.

This no longer works on google docs? Because it certainly used to and now it doesn't. Beyond that it's great