User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:30.0) Gecko/20100101 Firefox/30.0 (Beta/Release) Build ID: 20140605174243 Steps to reproduce: Turn off screensaver, set on option which turns off screen after X minutes of inactivity. Play video using HTML5 player, put in on fullscreen, do not interact with pc. After X minutes, screen turns off, while it shouldn't as it is common behavior by media players. Actual results: Screen turned off after X minutes of inactivity. Expected results: Screen should not turn off during fullscreen video playback using HTML5 player as it is common behavior by media players.

looks like a dupe of bug 797625