I can download personas, but I can't help it? Why? And how can I activate them?

I'm used to be able to use the personas, but no more. At one point they stopped working. When I click on 'Activate' nothing happens. Any idea what could happen?
Thank you.

See also:

  • Tools > Options > privacy > Firefox will be: "use the custom settings for history".
  • Uncheck the box: [] "always use the navigation mode private.

Tags: Firefox

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