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.