All jupyter contrib nbextensions are marked as possibly incompatible : <p>I have just installed <code>jupyter_contrib_nbextensions</code> by:</p>

<pre><code>pip install jupyter_contrib_nbextensions
jupyter contrib nbextension install --user
</code></pre>

<p>When I open a jupyter notebook and navigate to <strong><em>Edit -> nbextensions config</em></strong>, I see the below screen:</p>

<p><a href="https://i.stack.imgur.com/ClDy1.png" rel="noreferrer"><img src="https://i.stack.imgur.com/ClDy1.png" alt="nbextensions config"></a></p>

<p>All extensions are marked as "<strong><em>possibly incompatible</em></strong>". A solution is to uncheck the option: "<strong><em>disable configuration for nbextensions without explicit compatibility</em></strong>". But is it safe? Any ideas why the <code>nbextensions</code> are incombatible?</p>

<p>My package versions are:</p>

<pre><code>jupyter==1.0.0
notebook==6.0.1
jupyter-contrib-nbextensions==0.5.1
</code></pre>
