Telling the OS to disable screen savers seems dangerous because it is unlikely to revert if Firefox crashes while viewing the video.
I think maybe we should just send a dummy keystroke every ~55 seconds (with 1 minute being the lowest screensaver time limit). If we crashed while viewing the video then the screensaver would come back on and no settings would be inconsistent.
Telling the OS to disable screen savers seems dangerous because it is unlikely to revert if Firefox crashes while viewing the video.
I think maybe we should just send a dummy keystroke every ~55 seconds (with 1 minute being the lowest screensaver time limit). If we crashed while viewing the video then the screensaver would come back on and no settings would be inconsistent.