[IPython-User] Notebook cells doesn't execute

[klo uo]

In my desperate quest I managed to make Notebook execute cells, by
installing Opera!!
Who would thought?

Opera comes with websockets but disabled by default, and luckily after
enabling them I see executed code in Notebook!
That give me idea to see if websockets are disabled in my 15.0.1 Firefox,
but they seem running
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