Thank you for your review!

Possible there is an conflict with an other extension. Do you use any other Firefox extensions? Have you tried to disable those one by one except the Turn Off the Lights Firefox extension?

The unique Atmosphere Lighting feature use normal the GPU from your video cart. If you didn't disable the Hardware acceleration in your web browser.

If you still have this issue, please contact us on https://www.turnoffthelights.com/support

Thanks,