As others have said, this addon works, but the performance hit is just too great on Firefox.
Works well on Chrome, though.

The extension is fantastic, far better than any alternative I know of.

BUT: it seems to run significantly less smoothly than on Chrome, specifically running horribly on Google sites (Gmail, Calendar), Facebook and others. If you could some how address this issue it'll be great.

Wow, awesome, everything seems dark, fast & beautiful, nice work

good!

featurewise it's a good add-on but it's slowing down the surfing so much i had to deactivate it.

Works very well!!!

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le module qui devrait être inclus à Firefox, il est indispensable pour vos yeux, merci

This works surprisingly well! I recommend it very much.

3 étoiles noires serait plus juste

ralenti la navigation
impossible de basculer jour/nuit ( c'est pas prévu)
impossible à désactiver
impossible de supprimer

NOW USELESS ........
unfortunately, besides the fact that it really slows down all browser pages loading as mentioned by many users ....an even WORSE issue (which the developer refuses to respond to as i have messaged him directly over the past 2 months) is the FACT that one can no longer even SEE THE Scroll-bar on any given page ...it is so faint as to be virtually invisible (i actually had to use a magnifying glass to find the scroll-bar or scroll-button on every browser page) ...rendering Dark Reader Impractical and frankly USELESS. i have now switched over to Midnight Lizard, which has much better control and NO scroll-bar issues, can see the scroll-bar & scroll buttons perfectly using Midnight Lizard.

Really good but perfection-able: a function to change the font's size would be useful.
Sometime slow with some sites.

Slows down the page loading. A lot.
(about 4 or 5 times slower than other formatters). It's amazing how it is able to attract so many users.

The add-on I've been waiting 25 years for!