Why my browser is spawning invisible windows?

Operating system: OS X 10.9

To go about four months ago, I started seeing windows without title and not selectable spawning after my browser has been open for some time (i.e. after I visited a few sites). The number of these invisible windows develops over time, but is deleted if I close the browser and start a new session. He has persisted through many new versions of Firefox.

I tried disabling all the Add-ons. Still happens.

I tried to keep track of what sites caused the problem. No correlation.

Today, I uninstalled Firefox, use AppZapper - who should have removed everything - then installed a new. The only thing I imported were bookmarks in the backup directory in my old profile folder.

.. .and it goes again. Here is a screenshot: http://imgur.com/ojcODd1

Any help would be appreciated.

Default 'privacy.clearOnShutdown.cookies': false, is generally true. and network.cookie.lifetimePolicy': 1, is usually 0.

I don't know exactly if this is the result cookies not removed, but here is the subject: entries in config that stand version 34.

Tags: Firefox

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