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Firefox: why this extension does *not* shows in private window?

I am using Firefox 52.2.0. Some days ago, I installed No-Javascript Addon 1.0.9. Its button, which I have (or was given) shown in my address toolbar, is *not* shown in the same position, in a private window (of the same size!). I also could not find the button to customize the private window toolbar (since I discovered it is different).

What is wrong here? Did this extension choose to only be shown in "real" windows?

I am lazy to check or use only one main windows(es) to see (easily) if it is enabled or disabled.

    If this message and others are off-topic,
    disconsider that part of it, or ask it to be
    moved to another group. If someone replied
    here, my opinion is that there is no problem
    with that - a problem is something that is
    really rare, IMO.
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