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Full Screen Black Screen Effect

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When i click full screen in video on youtube, then i have black sceen and then I have videon in full screen. I don't want have black screen when i open video in full screen . I don't like this effect. How I can change this ? (I download 3 screenshots for you. On 2 screenshot you can see a black screen I don't like this black screen effect)

When i click full screen in video on youtube, then i have black sceen and then I have videon in full screen. I don't want have black screen when i open video in full screen . I don't like this effect. How I can change this ? (I download 3 screenshots for you. On 2 screenshot you can see a black screen I don't like this black screen effect)
Attached screenshots

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This would be done by adjusting the full-screen-api.transition-duration.enter and full-screen-api.transition-duration.leave preferences in the Configuration Editor for Firefox (about:config page). If you want to disable to effect completely, change the values to 0 0 (zero space zero).

After you restart Firefox, the fading effect should be gone.

Hope this helps.

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Thank you very much

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Chosen Solution

No problem!

I am glad to hear that your problem has been resolved. If you haven't already, please select the answer that solves the problem. This will help other users with similar problems find the solution.

Thank you for contacting Mozilla Support.