How to disable screen saver when watchin videos in full screen in firefox??

This happens only with Firefox, other browsers play videos normally and uninterrupted. I want to keep my window default screen saver but not when watching in full screen mode.

The Flash Player plugin normally should block the system from going to sleep, reducing display brightness, or going to screen saver when you use its full screen mode. It's strange that you have this issue with Flash.
There are some workarounds, like using an add-on or external program that simulates moving your mouse, but those really shouldn't be necessary.
VLC, I don't know.
By the way, have you shut down and restarted Windows since this problem first occurred? Just in case some shared component of Windows has crashed.

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