Do you see recently a black box below the YouTube player, when you dims the web page with the Turn Off the Lights browser extensions? Then this mean YouTube have update his website style again. To fix this problem is by make sure you have the latest Turn Off the Lights extension installed in your web browser.
Fix Black Box
- For Google Chrome go to the Chrome web store and download the latest version.
- For Firefox go to the add-on gallery and click the download button.
- For Opera go to the Opera gallery and download the latest version.
- For Safari open the Safari browser -> click on Safari -> Preference -> Extensions -> Updates.