Is it possible to get the data on wich hardware the browser is running and how much ram is available?
I fear we might ran out of ram on some devices.
engine.getGlInfo(), this will give info about GPU (depends on security settings for browser)
but in general browsers are sandboxed to hide such info, there are some browser specific flags / apis but for general use I know not any, maybe other have seen some tools 
browser type / version can be checked in navigation object, its not perfect but with some smart filtering / smart checks you could get your interested ones. (there are some ready libs like this as well)
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