Inhibits Power Management
Firefox inhibits power management, causing the screensaver to not activate. This happens when I am not running a video. It happens if I open a website that has video but I do not run the video. If I turn off Firefox the screensaver works. Screensaver is set to activate at 5 minutes. Power Management is set to turn off screen when inactive for 7 minutes. Linuxmint 21.3. and on another computer - Linuxmint 22.0
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Perhaps your website uses Wake Lock API which is implemented in Firefox since version 126.
Try to enter about:config in the address bar and switch dom.screenwakelock.enabled to false.
Before I do that, a question. If I mark it false will the screensaver activate while I am watching a video?
Works now. Screensaver stays off while watching Video and enables after specified time otherwise.