I'm browsing like ten hours a day, and this add-on takes care of my eyes. wouldn't want to be without it any more.

DARK BACKGROUND AND LIGHT TEXT is soo much better! More customizability and most importantly DOESN'T SLOW DOWN OR BREAK PAGES!
https://addons.mozilla.org/en-US/firefox/addon/dark-background-light-text/?utm_content=search&utm_medium=referral&utm_source=addons.mozilla.org

SHIVUTTAM

Slows down webpage loading by a lot
which something like Dark Background and Light Text doesn't do

Plug-in crashes pretty frequently and breaks websites. Otherwise, when it works, it works great.

good services

The extension itself is relatively good, but lacks the customizability of Midnight Lizard and like that extension, tends to reduce performance quite a bit.

A surprise when uninstalling the extension is that while most developers usually either show the sad emoticon while saying they're sorry and asking for feedback, Dark Reader merely wishes good luck. Hits worse than a sad face.

I genuinely support the extension, but Midnight Lizard offers a lot more customization, even considering the slow-down.