Microsoft Edge & sleepmode

I occasionally get the message (i.e. Avast pop-up) on my screen that Microsoft Edge has been taken out of sleep mode and is shutting down again when I close it.
The strange thing is that I am not using Edge, I am using Securebrowser. Is there any method to keep Edge permanently in sleep mode?

https://forum.avast.com/index.php?board=63.0