Both FIreFox and Chromium it is like your install wrapper is not working or something, even I went to this sight https://helpx.adobe.com/flash-player.html it still shows flash not working -- shows a number of directorys it searches and none of them are alive on Voild here you have your plugin installed onto your/this Void system. along with it does not match what it is looking for which is libpepflashplayer.so not libfreshwrapper-pepperflash.so -- I even install chromium and still it does not have needed plugin libpepflashplayer.so -- I downloads Adobies libflashplayer.so cp it into respecptive directories maknig a few of them that the sight showed in search path still no go in working