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I don't see the Unity section in Firefox preferences

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linux-howto

http://askubuntu.com – I found in another question on AskUbuntu someone had demonstrated on how to enable/disable sites that would integrate with Unity, in the webapps preview. There was a screenshot showing a "Unity" section in the Firefox preferences. I don't have that option. This is the screenshot: How can I get this option? Is there any package I need? This is the original question containing the screenshot: How to manage "Unity WebApps Chromium extension" different options? (HowTos)