It cost you nothing (zero comma zero)! Turn Off the Lights is a free browser extension for your favorite desktop web browser and you must not pay us to download and install this extension. The extension is available for web browser such as Google Chrome, Opera, Firefox, Safari, Maxthon, Microsoft Edge and Yandex browser. You can download it here on the official Turn Off the Lights website or on the browser extension gallery.
Cost Development Support
But you can donate us to keep this extension visible online for the other users. You choose an amount between the 1 and 250 euro, US dollar, Pound or Russian Ruble. If the donation amount is too low and want to donate a car value to us (or even a higher value). Then contact us using the support form on the right sidebar. You can donate using PayPal, credit card, master card, visa and bank. Also there is an option to donate with the virtual currency bitcoin payment. Where you choose self the cost that must send online in the peer network.
The cost will be used to maintain this domain and web hosting. And the platform cost to deliver this software to you and the new users.