Firefox - monitor blanking while watching fullscreen videos

I’m not sure if it’s just me or if it’s a problem with the latest Firefox. It doesn’t seem to be reporting to DPMS to stop the monitor from going blank.

If you also have this problem, the super + alt + B switch may be useful to toggle on/off monitor blanking.

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Are you having this issue always or when for example you are playing a video?

Not sure…
Monitor blanking in 10 minutes of inactivity is ok when I go away to make coffee or dinner.
But it is not ok when I watch some streams on YT.
This only happens to me in Firefox after the last update.

tested with powerkit (aur). Firefox is indeed inhabiting the screensaver when playing audio/video