Excellent job of darkening. But, as I use it more and more, I find more I would like improved. Now 3 stars, 20251107.
1. I can not (afaik) darken as subsite, e.g. www.ebay.com/itm. I can only darken the entire domain.
2. I can not add ANY entries to the SITE LIST. All I can do is change the few that are there.
3. new (20111107): I just discovered that Dark Reader is darkening not only the web site, but Firefox's control areas. (The tab bar, the location bar and the menu bar, all of which I display.) This is HORRIBLE. It makes some fields in these very difficult to see. Sadly, all these fields are not named GUI controls, which may be the reason. Particularly annoying since I spend much time customizing ALL the colors in those fields with custom .CSS.
4. The addon is very difficult to manage. There are essentially 2 ways.
A. Left click its icon on the location bar. This opens a Dark Reader control panel.
1) I can't scroll it and can't seeall of it. I use a 150% Windows magnification level. that's probably why.
2) I have no idea what the SEPIA value does
3) THIS CONTROL PANEL DOES NOT ALLOW ME TO CONTROL ALL THE SETTINGS I CAN CHANGE.
B. Right click its icon and choose "manage extension"
1) here we find controlling the shortcut keys
Why do not A and B include all the same stuff?
5. The documentation for this addon is only fair. (Otherwise, I would have learned all the above. I READ DOCUMENTATION for almost everything)
This include operation and use of the addon
and info about recent updates.
6. Functionality: The addon does a POOR job of handling shades of gray (actually all colors, but this is the most common example since many websites lack interesting use of color.) It says it darkens bright colors. But, it should also then brighten light color to retain contrast. Webpage areas in shades of shades are often turned unreadable.
7. Money
I would contribute, but find no way to do so. All I saw was a "buy it", but I don't even remember where I saw that.

the 3 rating is muchly due to the fact that some of these issues I have mentioned long, long ago.

I have two problems with Dark Reader. (1) When I change to a new tab or new content for a tab I typically get a bright white initial display before Dark Reader kicks in to style the new content, completely dazzling my dark-adapted eyes and obviating the point of the extension and (2) Critical content is often unreadable using Dark Reader. I'm guessing that the first problem is not easy to address given the self-imposed limitations of FF's new extension mechanism!

This add-on sometimes works like a charm, but often breaks webpages, making them unusable whether or not I toggle the add-on on or off entirely or for single websites. The add-on often makes necessary navigation text and links unreadable/invisible. Also, removing the add-on does not remove the CSS from these pages, I probably need to empty my caches.

I usually like to use this extension on Edge browser. However, it slows down Firefox, significantly. So, I disabled and stopped using it until developers fix it.

Usually good, but for some reason sometimes it becomes so heavy it crashes my whole laptop.

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

Slows performance signifikant and makes some content invisible

A good dark maker, unfortunately it is very slow. very very slow. Have to deinstall it.

Das Add-On sah erstmal super aus, hat aber nach ein paar Tagen den Browser stark ausgebremst und teilweise andere Funktionen blockiert, musste leider deinstallieren; schade.

It modifies structure of web pages rather than just making them dark. Sometimes the web pages aren't usable because of this add-on.

Was really enjoying this extension until recently when it kills itself a few times a day. I have had to "turn it back on" because all my websites are burning my eyes 3-4 times a day now. Never had this problem until last week.

使用中表示が非常に重くなるページが出てくる。（価格コム等。）DarkReaderをオフにした状態だと違和感なく開けるが、広告が多かったり複雑でごちゃごちゃした作りのサイトの表示は厳しいかもしれない。

works decently on some sites, but slows my browser down a lot and breaks sites i visit fairly often - on firefox android

Causes the browser to bog down and will cause it to stop working and shut down at times.

This addon used to be great. now its only 'this extention is slowing down this page' error. when i deleted the extension, sites opened within 1 second again. so by default this addon slows down loading.

Is good, but unfortunately is changing themes of Firefox.

This would be an awesome extension but after some weeks of usage the signifcant performance degradation in surfing sites is not bearable, anymore. As long as the performance is so bad I'm not able to use it unfortunately.

I loved this ad on but it made my browser beyond slow, would recommend otherwise, looking forward to updates.