Edit 20200628: Okay, time to get rid of this add-on. It breaks more and more sites all the time. Worse is, you don't know if the web site is broken or what!

Edit, 20200618: This addon BREAKS Paypal. It is certainly not nice to break a financial webpage. At Paypal I receive the message "Sorry about that! Looks like this action is not supported. Please return and report this error so that we support it in the future. (invalid client_id or redirect_url)". The error occurs when checking out an item on Ebay and selecting Paypay payment method.

This addon is good at what it does. However:
1. it is VERY SLOW, I find it much better than other "eye-saving" or "dark screening" addons. It's coloring options are much more comprehensive and it handles subtle shades of gray from the original web page well. (These often become indistinguishable with these addons.)
2. It breaks many pages
3. It needs a hotkey to disable/enable the current page. There are just too many things that become invisible too often.
4. The list of disabled pages needs to be sorted alphabetically.
5. The options page needs some cleanup and better explanation of what the options do.

Note: I was running FF 68. With that, I discovered DBLT (dark background light text) breaks the Zoom Page WE addon. Upgraded to FF74 and problem solved (with quick help from DBLT author!).

It's awful!

When I open the Overleaf LateX editor, the compiled LaTeX shows weird aliasing of the white on black text.

This app causes Firefox to crash.

I keep getting up at the navigation bar how to correct this or stop buttons. When I have used the Overdrive the High Contrast it never over rides it. I keep getting the window with the high cap A and low cap a. Al of this takes out the enjoyment of using FIREFOX. I use high black contrast due to my vision. Up to about 2 or 3 weeks ago, I never had a problem with this but now it shows up and delays me getting into the website of my choice. Un and reinstalling dows not correct the issue. I said this in case as in the past this is the info that I got.

Changed the look of Google Docs, now its impossible to work with google files, cant reverse it. Tried to uninstall and intall, no luck. Can't use Firefox any more because of this s**t.

I don't like the dark background and white text. Much prefer the contrary.

I want web page to darker only specific domain, not for all as default. So its need a list to dark color for the linked page- which is listed. And others all are non-darken.
Huge number of domains can visit by users. Yes, users who wants it always switching on/off for any site with their white list. And but some request is nearly same-that is, which users never need to use this darker software. But only for (suppose-) facebook, instagram, twitter, gmail, example.com1 ,2, and 3 (this 7 domains). He/she needs the list up. So two mode/group for list: 1)white list-not to darken & 2) Off mode- to perform darkening(for listed up) when switched off. And here, can disable option also be set.
Then users can disable extension or delete list as needs. If this possible system have in an extension- please reply me to define. I found nothing since two years to get it. Thank you

BEWARE! This extension "Dark Background and Light Text" screws up Brave and Chrome browsers for certain web sites. With the extension active, both Brave and Chrome do not properly access sites such as "Watts Up With That". Instead of full graphics etc, a basic text menu shows up, followed shortly after by being unable to access the site at all. This caused me a lot of trouble and angst. It looked as if the browser was the culprit, but I didn't think of removing the extension until late in the day.

It has destroyed all my Hotmail emails by turning the text permanently white so that it shows up to my email recipients as UNREADABLE white text on their white Hotmail backgrounds. WORST APP EVER

No instructions on how to use it. I turned it on and it looked great, but when I closed that page the other pages were still bright and i'm not going through the trouble of turning it on every time i go to a different page. I wonder how 48,000 people figured it out? I double checked and the only instructions are where to send money. Next!

constant white flashes. defeats the purpose and slows things down.

Breaks the structure of sites every time you change mode