I like the custom themes. And it's one of the few stylists that still works on discord.
But pages take longer to load, regardless of if i'm using a theme or not. Also while loading, it gives me a blank white spots on already dark pages.
I also had turned both the "sync" and "use by default" settings off. But it didn't change much.

This extension has allowed me to get the exact high contrast look I want for websites, seemingly not available from any existing themes - at least nothing I've been able to find. For that I give it full marks. Unfortunately I have to lower my rating because it slows down Firefox to such an extent that I had to disable it again.

me gusta mucho pero ralentiza el navegador

Does what it says it does, but unfortunately slows down my browser enough to where I usually just turn it off. It is nice to have if you are staying on one page for a long time.

Not bad, but as a replacement I can offer Dark Reader as a good competitor. A more concise menu and no unnecessary settings, I use it myself.

It works, but it is always a second too late.

Looks great but noticeably slows down page loading and introduces "hitches" when you scroll up and down.

The darkening works fine, but interferes heavily on page loading times. For instance, when trying to create a new event in Google Calendar, this extension adds about 2-5 seconds between the instant I click on an empty bit of calendar and the instant the new event dialog pops up. When I want to click on the X button to close that dialog, I also have to wait a few seconds before my clikc is registered.

I installed the competitor extension Dark Reader and I don't have this problem anymore.

Por qué requiere acceder a mis datos?.
La extensión queda lenta, se ve muy bien pero hace lenta la navegación.

Worked for the first 6 or 8 tabs I opened, and I was all set to be happy, but now every new tab gives the "Midnight Lizard cannot connect to this page" error. Tried restarting Firefox but cannot get it to work. It's weird because it still works on those original few tabs, but no new ones. Any suggestions? Thanks.

Sorry, I actually don't mean the New Tab page, I mean every page I open.

网页加载速度大大变慢

This addon stylizes pages with remarkable accuracy in terms of keeping the color dynamics of the inverted material and content itself as true to the original page as possible, but dark.

The unfortunate part is that due to performance I just was kinda forced to switch to Dark Reader. DR does an pretty good job of stylizing too, but it's not nearly as good as Midnight Lizard. I suppose that all comes at a price, however. On a better PC perhaps I would switch back to ML in a heart beat.

I did try playing with the settings extensively to get better performance and was able to make it usable, but I just can't really accept big 30 second lock ups when I load a especially intensive website that ML has to chew on for that long. Having big numbers of tabs open as I'm just so inclined to do for some reason I'll never understand also begins to take a big toll a lot sooner.

If you make any optimization breakthroughs or I get better hardware I'll absolutely give it another shot. Keep up the good work.

Edit: I did try simplified mode and it helped a lot, but the performance impact could still be felt. Honestly I can't recall what pages were the worst performing, but I will say it just varied even on the same website. It seems worse the more general load the CPU is experiencing while following links. Often Firefox would throw out a slow addon message about ML so that's the reason I knew it was definitely this addon slowing the browser down. The biggest issue was loading for the first time and having ML initialize everything. That was always causing a noticeable struggle regardless of the site.

Tried it on facebook. Makes it very slow and the newsfeed won't load instantly when scrolling down. You have to wait a few seconds (about 5) for new content to load before you can keep scrolling downwards.

Looks great and works pretty well. Behaviour can look a little odd on sites that are already dark but by and large I prefer my web like this.
My biggest gripe is that it introduces some performance problems on some sites. In particular I use a self-hosted site for asset management (Snipe-IT), and when searching of different assets or other items this add-on introduces lag when I type different search terms and the content of the page (the search results) dynamically changes in response.