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I find some questions talking about disabling xscreensaver with flash but no one about HTML5. Then, how to disable xscreensaver when firefox is playing an HTML5 vidieo and, if possible, only for some domain?

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It's related to your plugin and add-on in your firefox, check them and disable some them. – PersianGulf Feb 27 '14 at 9:07
I haven’t install any plug-in or add-on to watch videos with Firefox. I see videos with the default settings. I talk about videos in HTML5. – fauve Feb 27 '14 at 10:01
So you talk about your GNU\Linux, explain me Xscreensaver or gnome screen saver or KDE screen saver? – PersianGulf Feb 27 '14 at 11:53
Yes, my distribution is Gentoo. I use Xscreensaver to lock my screen. I configure Xscreensaver to autolock every 5min. Then I would like disable autolocking when a video is played by Firefox. For example, I can do this with mplayer with the line heartbeat-cmd="xscreensaver-command -deactivate" in the ~/.mplayer/config. – fauve Feb 27 '14 at 20:43

You can write it in your ~/mplayer/config : stop-xscreensaver=1

And remove the following line:

heartbeat-cmd="xscreensaver-command -deactivate"
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It doesn’t work with my mplayer. But, with the old command it work fine. Anyway, I haven’t any problem with mplayer; I have problem only with firefox. – fauve Feb 28 '14 at 0:15
you can use pid=`ps ax |egrep xscreensaver |awk {'print $1'}` ; kill $pid; you should put the above code in the rc.local – PersianGulf Feb 28 '14 at 1:59
Hmm… it isn’t a god idea because you kill xscreensaver. I was searching a way like the tip for mplayer: xscreensaver stay runing but didn’t autolock; then when mplayer is playing a video and I run xscreensaver-command -lock I can lock my screen. And when I close mplayer xscreensaver recover his normal way. Thank you Mohsen, I see you try to help me but it isn’t exactly what I was searching ☺ – fauve Feb 28 '14 at 4:30

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