Screensaver starts while watching Flash Videos

Hey,
I'm using xfce4 and the built-in XScreenSaver 5.15
I have this annoying issue that the screensaver pops-up while I'm watching flash videos. I mean if the video is longer than 5 minutes and I usually leave the mouse alone while I'm watching the screensaver thinks I'm inactive and starts up.
Is there a way to make the screensaver recognize flash videos as an activity so it doesn't turn on while they are running ? Thanks.
I'm using xfce4 and the built-in XScreenSaver 5.15
I have this annoying issue that the screensaver pops-up while I'm watching flash videos. I mean if the video is longer than 5 minutes and I usually leave the mouse alone while I'm watching the screensaver thinks I'm inactive and starts up.
Is there a way to make the screensaver recognize flash videos as an activity so it doesn't turn on while they are running ? Thanks.