[Bug 2047262]

[Mbarriolinares]

Before closing firefox in the log I attached above, video was playing
and there was NO inhibitor in dbus:

```
# dbus-send --dest=org.freedesktop.PowerManagement --print-reply=literal /org/freedesktop/PowerManagement/Inhibit org.freedesktop.PowerManagement.Inhibit.GetInhibitors
   array [
   ]
```

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https://bugs.launchpad.net/bugs/2047262

Title:
  Firefox stopped inhibiting screensaver on video playback

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