Unity Player installed, but keep getting message that it isn't?

Unity Hub
1

I run “build and run” command but keep getting “Install Unity Web Player” in Firefox.

What could be wrong, or what could I be doing wrong?

I installed it two times and I get the message that it installed successfully.

My system is Windows 7 and I use Unity 5.1.4

2

Let me guess, I should use WebGL(HTML5) build which requires 64bit Windows and Unity3D?

https://blogs.unity3d.com/2015/10/08/unity-web-player-roadmap/

Can I still build my game and run it in 32bit Windows/Firefox if I update to Unity 5.3?

3

Mozilla deprecated the NPAPI (an API the WebPlayer is based on) in Firefox 52 (it still works in Firefox ESR).
That means you’ll need to utilize WebGL.

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