How to activate YouTube Dark Mode in Chrome, Firefox, Edge, Opera

Today we cannot spend a day without checking our computers, tablets, and smartphones. The technology forced us to stay connected and look at screens for a prolonged duration, which can affect our health, especially if there is not enough light around. You may have heard about a monitor with a low-light setup, which based on controlling the amount of blue light emitted by the screen. Blue light allows to improve viewing angles in bright sunlight, but at night (or low light) it can cause brain fatigue. It makes your brain cells confuse this light with normal daylight.     

Prolonged exposure to blue light provokes mental fatigue, may ruin your normal sleep cycle, cause eye strain, and overall has a negative effect on your health. That is why a so-called “night mode” or dark mode was invented. It is probably available on your smartphone and tablet. Also, some apps and services added this mode to their arsenal of features. Should you enable this mode, and the effect of blue light will be drastically reduced in a low-light environment. Also, the dark mode is popular among digital readers and content watchers as it creates a nice ambient environment, comfortable for eyes. No wonder that YouTube also added a night mode for those who enjoy watching videos in the dark but don’t want to strain their eyes. No matter what web browser you are using – Chrome, Edge, Opera, or Firefox – you can activate this mode right now. Read on, and we will explain how.  

Activate YouTube Dark Mode

You may think that this mode is available for everyone in YouTube settings, some kind of switch or whatever, but, in fact, it is hidden. It is impossible to switch to the night mode right away in one click. However, some minor settings tweaks will get you there, and you will be ready to watch videos in the low-light environment with no harm. Harmful blue light won’t be a problem anymore. In this guide, we will tell what settings you need to change in your browser and how to do it. 

Enable dark mode on YouTube in Google Chrome

Run your Google Chrome.

Open the developer’s menu (the combination of Ctrl+Shift+I or just the F12 key will get you there).

When in the menu, find the Console tab and type this line of code and hit Enter:

document.cookie=”VISITOR_INFO1_LIVE=fPQ4jCL6EiE; path=/”

If you did this while logged into your account on YouTube, you can immediately open your profile and select the Dark Theme option. Use the switch to turn it on or off.  

If you were not logged into your account, go to Settings instead. There you will find your Dark Mode option. Toggle Dark Theme on or off using the switch.

When you activate the dark mode, you will see the difference – everything will be in a warm low-light interface.

Activate dark mode on YouTube in Firefox

If you are using Mozilla Firefox, you need to open YouTube first and login into your account.

Open Tools, select Web Developer.

Open Web Console and type the following line of code:


Now you have the Dark Mode option in your YouTube profile. You can turn it on/off anytime.

Enable dark mode on YouTube in Opera

Open main YouTube page and login in your account using Opera.

Click View and select Show Developer Tools.

Go to Developer, find the Developer Tools button and click it.

Now add this code in the console:

var cookieDate = new Date();

cookieDate.setFullYear(cookieDate.getFullYear( ) + 1);

document.cookie=”VISITOR_INFO1_LIVE=fPQ4jCL6EiE; expires=” + cookie Date.toGMTString( ) + “; path=/”;

When it is done, you can close the panel. Dark Mode will be activated after you refresh the page.

Activate dark mode on YouTube in Microsoft Edge browser

Login into your YouTube account using Microsoft Edge.

Now press F12 to open Developer Tools.

Find the Console button, click it, and type the following line of code:


Hit Enter and refresh the page – the dark mode on YouTube is now active!