Firefox 29 Top Bar is Transparent on Windows 8.1

I just installed Firefox 29 on a laptop (Lenovo Yoga 2 Pro with very high resolution) that runs Windows 8.1.
The tabs are transparent and show whatever is behind, either the desktop (e.g. the trash icon) or the application that was active previous to Firefox.
In my screenshot, this is Microsoft Outlook.
How can I fix this?

The issue has suddenly gone away.
I suspect it has something to do with connecting the external monitor.
Now everything is fine also without the external display.
Strange...

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