At the first game loading, on your address bar's browser, there is a small icon on the left side. That means Mozilla need your permission to let the plugin automatically run on your browser. Click "Continue Allowing", so you don't have to allow again next time.
Or you can active the plugin manually. How? Go to setting, then adds on, find "unity player" then always to active
This is a good way to explain the installation process of the firefox browser. Thanks to share...
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