How to hide (not disable) one or multiple extension(s) in Add-ons Manager?

I have installed Play Music 1.6 on my computer. However, this extension shows up in the Add-ons Manager of my computer. I don't want anyone to be able to see the description nor disable this extension. My nephews use my computer frequently and I want to make sure they are not going to inappropriate websites.

Note that you still see the extension on the "Help > Troubleshooting Information" page and that starting in Safe mode will disable it like all other extensions (i.e. starting with Shift pressed is sufficient).
*https://support.mozilla.org/kb/Using+the+Troubleshooting+Information+page

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