It harms nothing being there.
Technically speaking, it occupies your computing device's memory, which can be interpreted as a form of harm.
That and we have no idea what it is really doing while running, or if it really exits...
Widevine is "DRM and Content Protection" scheme (see http://www.widevine.com). But is it open source? The Widevine plugin appears to be a binary without any source code.
Is Mozilla putting a binary blob into Firefox, or do they have the source code for Widevine?
And queue a bunch of the beginner Linux sites releasing articles on how to pin Firefox on 48. Because "Hell no" to that crap on my system.
This move from modularity to massive monoliths...controlled entirely by three major vendors for some reason is praised by the software development community.
What is it about freedom and control of your own systems that makes even professionals so afraid?
And I thought Firefox was a fat bloated pig before. Anyone have any recommendations for a lean browser?
If you are running a Redis server accepting connections from the open Internet, you are an idiot.
Good thing we don't have too many of them! No, wait...