It slows down webpages as well as the browser. I am going to uninstall it. This extension needs a lot of improvement.

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.

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.

Slows down sites to the point of being unusable. No read the manual section. Counterintuitive settings.

There are a lot of little bugs. Sometimes, I have to switch the extension off and on before it loads a side. Sometimes, when I add a site to my exceptions list it renders it as "dark" anyway. A lot of major sites (such as google.com) have parts of UI become invisible with this plug-in active (at least in dark mode). Kinda neat, but not up to the Chrome version yet.

Dark Mode - an extension I've been trying in this one's stead has a much smaller feature set but works far more reliably.

It really slowed down my browsing experience. It was so slow I had to uninstall. Looks like it works really well and has a lot of options. But this doesn't matter if it's too slow to use

Great idea but it makes pages slow. Needs to be addressed.

I want to like this add-on. I really do. I love everything else about it except it causes excessive loading times.

It's good on Chrome, but a disaster on Firefox. It integrates great with Facebook on Chrome, it's awful with FB on Firefox. Fix it before you release it. Cheers!

Good idea and i liked it. Mobil version seem better than Laptop version.
It slows the hell out of the PC! :S

Firefox becomes unusable as I only have 4 GB of RAM and it keeps freezing and is otherwise slow with this. Manjaro Linux OS. When disabling Firefox is normal again.
```bash
[jray@jr-dl ~]$ inxi -Fxz
System: Host: jr-dl Kernel: 4.19.2-1-MANJARO x86_64 bits: 64 compiler: gcc v: 8.2.1 Desktop: N/A Distro: Manjaro Linux
Machine: Type: Laptop System: Dell product: Latitude E6410 v: 0001 serial:
Mobo: Dell model: 0HNGW4 serial: UEFI: Dell v: A16 date: 12/05/2013
Battery: ID-1: BAT0 charge: 37.2 Wh condition: 37.2/48.8 Wh (76%) model: Samsung SDI DELL PT43699 status: Full
CPU: Topology: Dual Core model: Intel Core i5 M 560 bits: 64 type: MT MCP arch: Nehalem rev: 5 L2 cache: 3072 KiB
flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 21290
Speed: 1197 MHz min/max: 1199/2667 MHz Core speeds (MHz): 1: 1325 2: 1200 3: 1320 4: 1442
Graphics: Device-1: Intel Core Processor Integrated Graphics vendor: Dell Latitude E6410 driver: i915 v: kernel
bus ID: 00:02.0
Display: x11 server: X.Org 1.20.3 driver: intel unloaded: modesetting resolution: 1440x900~60Hz, 1920x1080~60Hz
OpenGL: renderer: Mesa DRI Intel Ironlake Mobile v: 2.1 Mesa 18.2.5 direct render: Yes
Audio: Device-1: Intel 5 Series/3400 Series High Definition Audio vendor: Dell Latitude E6410 driver: snd_hda_intel
v: kernel bus ID: 00:1b.0
Sound Server: ALSA v: k4.19.2-1-MANJARO
Network: Device-1: Intel 82577LM Gigabit Network vendor: Dell Latitude E6410 driver: e1000e v: 3.2.6-k port: 7040
bus ID: 00:19.0
IF: eno1 state: up speed: 1000 Mbps duplex: full mac:
Device-2: Broadcom Limited BCM43224 802.11a/b/g/n vendor: Dell Wireless 1520 Half-size Mini PCIe Card driver: wl
v: kernel port: 7000 bus ID: 02:00.0
IF: wlp2s0 state: down mac:
Drives: Local Storage: total: 1.20 TiB used: 67.28 GiB (5.5%)
ID-1: /dev/sda vendor: Seagate model: ST9320423AS size: 298.09 GiB
ID-2: /dev/sdb type: USB vendor: Seagate model: Expansion size: 931.51 GiB
Partition: ID-1: / size: 284.06 GiB used: 19.33 GiB (6.8%) fs: ext4 dev: /dev/sda2
ID-2: swap-1 size: 8.18 GiB used: 1.67 GiB (20.4%) fs: swap dev: /dev/sda3
Sensors: System Temperatures: cpu: 49.0 C mobo: N/A sodimm: 43.0 C
Fan Speeds (RPM): cpu: 2901
Info: Processes: 202 Uptime: 7h 22m Memory: 3.72 GiB used: 2.22 GiB (59.9%) Init: systemd Compilers: gcc: 8.2.1
Shell: bash v: 4.4.23 inxi: 3.0.27
```

I must say this is by far the best looking extension I have ever used; but the performance is horrific, when loading specific websites it grinds your PC to a halt, and my computer is not a low spec machine.

i want to love it but it makes everything unbearably slow

Interferes with Firefox browser, not enough customization for prime time for me, and as everyone else mentioned, it slows performance.

Been using this for a while now, while it is one of the few that actually works, it slows down browsing by a LOT. PLEASE PLEASE fix this

The Firefox version makes using this thing so annoying. It's great under Chrome but for some reason it slows down load times so much it's impossible to use with Firefox.

I mean, it's a great idea and when it works it works well, but if I wanted to wait 5 seconds for each page to load I'd stop paying for my high speed cable connection. I gave up on Chrome after the latest update and wanted to move all my plugins over to Firefox. The is the only one that caused enough hassle that I had to give it up. Too bad I got so used to it under Chrome.

Awesome add-on but the Firefox version slows down a lot the browser. The Chrome version is perfect (but the browser isn't)

Es una muybuena extension, pero la eficacia de navegacion se ve reducida.

it makes Firefox hang and so slow

this is so close to being perfect.

websites look great but some are running slower and giving errors. i'll check back in a month or two to see if it has been updated!

Pages load extremely slow after installing this extension. Besides an ad blocker, I have no other extensions installed and I found that some pages wouldn't even load without a "stop script" pop-up.