Problems using firefox under windows 8.1

I can't using mozilla firefox in my laptop windows 8.1 as a desktop browser. Whenever I visit a Web site, it opens as a mobile browser. It happens with all the websites I've tried so far. I have uninstalled and installed the browser several times, but this is not help me at all. It's really frustrating guys. Need assistance immediately please.

Thank you

It is the user agent string if you are running Windows 8.1 64-bit with the latest version of Firefox.

Mozilla/5.0 (Windows NT 6.3; WOW64; RV:39.0) Gecko/20100101 Firefox/39.0

Tags: Firefox

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