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My Computer screen dims dark while watching Amazon Prime movies on Firefox.

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Dear Firefox,

My Computer screen dims dark while watching Amazon Prime movies on Firefox. At first, I thought something was wrong with my computer, and after a series of attempts to fix the problem, I soon gave up and tried watching the Video on Safari and then Google; to my surprise, watching the Video on both Safari and Google my screen held steady and never Dimmed?

Dear Firefox, My Computer screen dims dark while watching Amazon Prime movies on Firefox. At first, I thought something was wrong with my computer, and after a series of attempts to fix the problem, I soon gave up and tried watching the Video on Safari and then Google; to my surprise, watching the Video on both Safari and Google my screen held steady and never Dimmed?

Alla svar (2)

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Some websites have a setting to darken the display during the playing of videos.

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I have same problem. It's a new issue; didn't happen last 2 years on FireFox, and now it does. Using Safari fixes it.