The basic steps for all web browsers to see the gray lamp button. Is to restart your web browser and go to a website, such as www.youtube.com.
Google Chrome users
If you use Google Chrome v83 or higher, you must click on the puzzle icon to see all your installed Chrome extension.

Google Chrome
You see the Turn Off the Lights Chrome extension gray lamp icon right in the toolbar.

Know issue from Chromium:
If you have a HD screen and your are using Windows, it doesn’t show the lamp icon because the render bug. You can fix this self by changing your HDPI value to a lower setting https://code.google.com/p/chromium/issues/detail?id=381383
Yandex
You see the button right of the address bar.
Safari
You see the button left of the address bar.
Firefox
The button is visible right of the address bar. But if you see no lamp button. Then go to View -> Toolbars -> Customize in the menu. And drag the “Turn Off the Lights” addon to your toolbar.
Opera
You see the button right of the address bar.
Vivaldi
You see the button right of the address bar.
Brave
You see the button right of the address bar.
Microsoft Edge (EdgeHTML and Chromium)
You see the button right of the address bar.
Maxthon
Left in the navigation bar you see the gray lamp button.
Do you still have a problem, please do not hesitate to contact us. You can go to the “Contact Us email” button. And report your problem.
Did you find technical, factual or grammatical errors on the Turn Off the Lights website?
You can report a technical problem using the Turn Off the Lights online technical error feedback form.